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Life Sciences
Occasional Papers

Royal Ontario Museum
June 19, 1974

No. 25

A New Subspecies of the Bat Eumops auripendulus
(Chiroptera: Molossidae), from Argentina and
Eastern Brazil1

by Judy L. Eger2

Abstract — The mastiff bat, Eumops auripen-
dulus (Chiroptera: Molossidae) occurs from
southern Mexico to northeastern Argentina.
In eastern Brazil and northeastern Argentina
is a population that is morphologically distinct
from other Eumops auripendulus. The new
subspecies is geographically isolated from,
and larger than Eumops a. auripendulus
which occurs from the Amazon region of
South America to southern Mexico.

[Chiroptera; Molossidae; Eumops auri-
pendulus; subspecies novum; systematics.]

The mastiff bat, Eumops auripendulus
(Shaw), first named the slouch-eared bat by
Pennant ( 1793), was described by him from
a drawing made by Buffon in 1789 (see
Goodwin, 1960). Subsequently, Shaw (1800)
renamed this species Vespertilio auripen-
dulus. The specimen sketched by Buffon
(1789) was from Cayenne, French Guiana,
and therefore Cayenne is the type locality.
According to Husson (1962), authors pub-
lishing since 1876 considered Dysopes ab-
rasus Temminck (1827) to be the same
species as V. auripendulus. But Husson
(1962) extracted the skull of the type of
D. abrasus and demonstrated that this speci-

men was not a Eumops but actually belonged
to the genus Cynomops Thomas (1920).
Thus Goodwin (1960) reassigned V. auri-
pendulus to E. auripendulus. Consequently,
E. auripendulus should be the name applied
to these bats from the Guianas region.

Eumops auripendulus occurs from south-
ern Mexico south to northern Argentina, and
two specimens are known from Jamaica
(9.1.4.48, British Museum (Natural His-
tory); no number, Institute of Jamaica).
Sanborn (1932), in his review of the genus
Eumops, listed two races of E. abrasus ( = E.
auripendulus) and assigned four specimens
from eastern Brazil to E. abrasus abrasus
and all other specimens to E. abrasus milled.
As E. auripendulus is the valid specific name,
E. abrasus milleri is therefore synonymous
with E. auripendulus auripendulus. In a
recent review of the genus Eumops (Eger,
1973), I confirmed that Sanborn was correct
in recognizing a distinct, isolated population
of E. auripendulus in eastern Brazil. In this
study 14 additional specimens of this popula-
tion were identified and the distribution of
the new subspecies, described herein, is
known to extend southward to Misiones,
Argentina.

1 Based in part on a thesis submitted in partial fulfilment for the degree of M.Sc, Department of Zoology,
University of Toronto, October 1973.

2 Department of Mammalogy, Royal Ontario Museum, Toronto.

Materials and Methods — The 305 specimens
examined were either study skins and skulls
or specimens preserved in alcohol (some
with skulls removed). Specimens examined
are in the collections of the following institu-
tions: American Museum of Natural History
(amnh); Academy of Natural Sciences of
Philadelphia (ansp); British Museum (Nat.
Hist.) (bmnh); Carnegie Museum (cm);
Field Museum of Natural History (fmnh);
Institute of Jamaica (u); The Museum of
Natural History, University of Kansas (ku);
Los Angeles County Museum (lacm); Mu-
seum of Comparative Zoology, Harvard Uni-
versity (mcz); Museum National d'Histoire
Naturelle, Paris and Brunoy (mnhn); Mu-
seum of Vertebrate Zoology, University of
California, Berkeley (mvz); Rijksmuseum
van Naturlijke Historie, Leiden (rmnh);
Royal Ontario Museum (rom); Texas Co-
operative Wildlife Research Collection, Texas
A&M University (tcwc); Universidade de
Sao Paulo (usp); Universidad Nacional
Autonoma de Mexico (unam); and the
National Museum of Natural History
(usnm).

Thirty-eight morphometric characters were
studied. Measurements, in millimetres (mm),
were taken with dial calipers to the nearest
0. 1 mm for wing bones, to the nearest 1 .0 mm
for body measurements, and to the nearest
0.05 mm for cranial measurements. The
length of the tibia, often difficult to measure,
was verified by radiographs where possible.
Descriptions of pelage colour follow those
given by Ridgway (1912).

Conventional morphological characters
employed in chiropteran systematics were
measured and are: External - Forearm
(FOAR); metacarpals 3, 4, and 5 (3DME,
4DME, 5DME); phalanges 1 and 2 (1PHL,
2PHL) of third, fourth and fifth digits; total
length (TLEN); tail vertebrae (TVER);
hind foot, including claws (HDFT) ; ear from
notch (EARS); tragus (TRAG); and tibia
(TIBI). Mandible - Condyloincisive length
(CIMA); greatest length (GRLG), meas-
ured from one condyle to anterior face of
incisors; canine to third molar (C-M.O ; width
across canines (Ci-Ci), including cingula;
and height of lower canines (HTLC), mea-

sured bucally from base of cingulum to crown.
Broken or obviously worn teeth were not
measured. Skull - Width of septum between
basisphenoid pits (WBSP); length of basi-
sphenoid pit (LBSP); total length (TOLG),
measured from lambdoidal crest to anterior
face of incisors; condyloincisive length
(CBLG); palatal length (PALA), meas-
ured from anterior face of incisor to posterior
margin of palate, lateral to posteromedial pro-
jection; zygomatic width (ZYGO); mastoid
width (MAST); lachrymal width (LACH);
interorbital width (IOWI); height of brain-
case (HBCA), measured from ventral bor-
der of foramen magnum to top of skull, not
including sagittal crest; width across third
molars (M3-M3); canine to third molar
(C-M3); width across canines (O-C1), in-
cluding cingula; height of upper canines
(HTUC), measured bucally from base of
cingulum to crown; postorbital constriction
(POCO); breadth of braincase (BBC1),
anterior width of braincase measured where
zygoma anastomose with parietals; and
breadth of braincase (BBC2), measured
dorsal to auditory bullae with blades of
calipers resting on zygoma.

Localities of E. auripendulus (Fig. 1) are
of specimens examined, records of immature
specimens, and records from the literature.
A study of sexual dimorphism of eight taxa
indicated that male and female Eumops were
dimorphic in a minimum of 26 per cent of the
characters (Eger, 1973). Means and standard
errors (S.E.) of all characters were calculated
separately for males and females.

As E. a. auripendulus varies clinally, in-
creasing in size from north to south (Eger,
1973), specimens from eastern Brazil and
northern Argentina were compared only with
those from the adjacent Amazon region of
Brazil. Differences in character means were
examined using Student's ?-test (Sokal and
Rohlf, 1969). Asterisks denote probability
values as follows: *** = P ^ 0.001; ** =
p ^ 0.01 ; * = P < 0.05; and ns = P > 0.05.

Eumops auripendulus major ssp. nov.
Holotype — rom 50196, adult male, skin and
skull, collected 17 April 1968 by H. Delpie-
tro, purchased from Abel Fornes.

120 105

90

75 60 45

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Fig. 1 — Distribution of Eumops a. auripendulus and E. a. major in Middle and South America as determined
from localities of specimens examined and from literature records.

Type locality— Campo Viera (27°15'S,
55°10'W), Misiones, Argentina.

Distribution — Northeastern Argentina and
eastern Brazil (Fig. 1).

Description — Dorsal pelage Blackish-brown
with pale basal band; ventral pelage Mummy
Brown with white basal band; pinnae broad,
arising from single point on forehead, united
at base; tragus small and pointed; antitragus
twice as broad as high; wing membranes
furred proximal to forearm and on proximal
ends of metacarpals; guard hairs on feet long.
Dental formula ^ \ f f ; first upper premolar
small, external to toothrow; canine and

second premolar in contact; third commis-
sure of third upper molar absent; basisphe-
noid pits shallow but well defined (Fig. 2b).

Measurements of the holotype — See Table 1 .

Comparison — Eumops auripendulus major is
similar in colour to E. a. auripendulus but
statistically significantly larger in 27 of 38
characters in males and in 31 of 38 charac-
ters in females (Tables 1 and 2). Measure-
ments of FOAR, 3DME, CIMA, GRLG,
C-M3, C-M3 (females only), TOLG, and
CBLG do not overlap in specimens of the two
subspecies.

Specimens examined — (Those used in analy-
sis marked with f )

Fig. 2 (scale bars = 5 mm). — Eumops auripen-
diilus major ssp. nov. Holotype, ROM 50196, adult
male (left) and E. a. auripendulus amnh 78875,
adult male (right).

a. Dorsal view of skull. GRLG: 27.1 mm (left)
and 25.3 mm (right).

b. Ventral view of skull. C-lvF: 10.4 mm (left) and
9.4 mm (right).

C. Dorsal view of mandible. C-M3: 11.7 mm (left)
and 10.5 mm (right).

Eumops auripendulus major
ARGENTINA. Misiones: no locality, If
(ROM); Bonpland (27°30'S, 56°0'W), If
(ROM);Campo Viera (27°15'S, 55°10'W),
2f (rom); Colonia Martires (approx. 28 °S,
56°W),2f (ROM).

BRAZIL. Bahia: Lamarao (11°46'S,
38°53'W), 1 (BMNH).

Ceara: Baturite (4°20'S, 38°53'W), If
(fmnh); Quixada (4°58'S, 39°01'W), 2f
(fmnh).

Espirito Santo: Santa Teresa (19°55'S,
40°36'W), If (usp).

Minas Gerais: Manejo (21°50'S, 45°44'
W),2f (mcz).

Sao Paulo: Emas Pirassununga (21°56'
S, 47°22'W), If (usp);Iporanga (24°35'S,
48°35'W), It (mcz); Itapetininga (23°36'
S, 48°07'W), It (mcz); Juquia (24°19'S,
47°38'W), It (usp); Ribeirao Preto (21°
10'S, 47°48'W), 4f (usp); Sao Paulo
(23°33'S, 46°39'W), It (usp).

Eumops auripendulus auripendulus
BOLIVIA. Beni: Camiaco, 16 km N Limo-
quique(=Limoquije) (15°15'S, 64°46'W),
1 (amnh).

La Paz: Ixiamas (13°45'S, 68°10'W),
1 (usnm).

BRAZIL. No locality, 29f (mcz); Lake
Hyanuary, It (mcz).

Acre: Placido de Castro (10°20'S, 67°
ll'W), lOt (usp); Tarauaca (8°10'S,
70°46'W), It (usp).

Amazonas: Lagoa Anama, Tacambu
(2°35'S, 64°40'W), 1 (bmnh); Xingu
(7°48'S, 68°45'W), 3f (lacm); Manaca-
puru (3°18'S, 60°37'W), 1 (bmnh); mouth
of Lake Tefe (3°27'S, 64°47'W), 4f
(amnh).

Mato Grosso: Sao Domingos, Rio das
Mortes (11°45'S, 50°44'W), It (usp).

Para: Boim near Rio Tapajos (2°49'S,
55°10'W), 2t (usp); Para (Belem) (1°27'
S, 48°29'W), It (mcz); Faro (2°10'S,
56°39'W), 7f (amnh); Rio Tapajos, Li-
moal (2°24'S, 54°41'W), It (AMNH);Mor-
cego (0°58'S, 52°40'W), It (usp); Santa-
rem (2°26'S, 54°41'W), 2t (mnhn).

table 1. Sample statistics and Student's r-tests of male Eumops a. auripendulus from the Amazon region of Brazil
and male E. a. major from eastern Brazil and northeastern Argentina

E. a. auripendulus

E. a. major

Holotype

Student's

Character

n

Mean

±S.E.

ROM 50196 <J

n

Mean

±S.E.

/ value

FOAR

14

58.6

0.33

65.0

8

64.2

0.70

7 24***

3DME

16

60.6

0.46

65.7

8

66.1

0.49

7.38***

1PHL

16

25.5

0.21

28.3

8

28.3

0.30

7 gj ***

2PHL

16

23.3

0.22

23.7

8

25.6

0.37

5.65***

4DME

16

58.4

0.50

62.3

8

63.4

0.42

7.66***

1PHL

16

21.5

0.21

23.0

8

23.9

0.39

6.10***

2PHL

16

5.7

0.17

6.0

8

6.1

0.20

1.38 ns

5DME

16

32.8

0.25

35.3

8

35.9

0.54

5.30***

1PHL

16

17.6

0.15

19.4

7

19.3

0.24

6.15***

2PHL

16

5.5

0.07

5.0

8

6.0

0.20

2.42*

TLEN

2

146.0

—

149.0

5

144.0

2.86

—

TVER

4

47.8

2.84

55.0

6

55.2

2.02

2.19ns

HDFT

6

11.7

0.76

11.0

5

12.6

1.03

0.74 ns

EARS

1

21.0

—

19.0

4

19.5

1.26

0.52 ns

TRAG

0

—

—

3.0

3

3.7

0.67

—

TIBI

10

16.1

0.25

18.4

6

18.3

0.44

A 79***

HTLC

6

4.1

0.03

4.8

4

4.8

0.08

7.35*

HTUC

5

4.2

0.08

4.6

4

4.6

0.12

3.31*

WBSP

6

0.6

0.04

0.7

6

0.8

0.06

2.57*

LBSP

6

1.8

0.12

2.2

6

2.0

0.15

1.21 ns

CIMA

5

17.4

0.16

18.9

5

18.7

0.14

6.03***

GRLG

6

17.8

0.17

19.4

6

19.1

0.15

5 4g***

C-M3

6

10.6

0.09

11.7

6

11.4

0.09

6.26***

Ci-d

6

3.9

0.19

4.5

9

3.9

0.06

2.11 ns

TOLG

6

25.4

0.11

27.1

6

27.2

0.23

7.30***

CBLG

5

23.4

0.24

25.1

6

25.0

0.15

C QA***

PALA

6

11.3

0.08

12.1

6

12.1

0.04

8.72***

ZYGO

6

14.4

0.15

15.7

6

15.4

0.10

5.21***

MAST

5

12.6

0.12

12.8

5

13.1

0.15

2.82*

LACH

6

8.2

0.21

8.3

6

8.6

0.08

1 . 50 ns

IOWI

6

7.9

0.14

8.2

6

8.2

0.07

1.37 ns

HBCA

6

8.7

0.10

9.0

6

9.2

0.07

4.52***

M3-M3

6

10.1

0.13

11.0

6

10.7

0.07

3.97**

C-M3

6

9.5

0.11

10.4

6

10.3

0.12

4.92***

C'-C1

6

6.2

0.14

6.5

6

6.6

0.10

2.23*

POCO

6

4.8

0.08

4.7

6

4.7

0.06

0.50 ns

BBC1

5

10.8

0.14

11.1

5

11.1

0.09

2.30*

BBC2

6

11.5

0.09

12.3

6

12.2

0.13

4.60***

BRITISH HONDURAS. Rockstone Pond
(17°46'N, 88°22'W), 1 (ROM).
COLOMBIA. Antioquia: Medellin (6°15'N,
75°36'W), 1 (bmnh).

Bolivar: Mompos (9°15'N, 74°35'W),
2 (usnm).

Cauca: Popayan (2°27'N, 76°22'W), 1

(ROM).

Magdalena: Don Diego (11°00'N, 73°
43'W), 10 (cm).

Meta: Guiacaramo (4°35'N, 73°00'W),
4 (mcz), 1 (amnh); Villavicencio (4°09'N,

73°38'W), 1 (ROM), 2 (FMNH), 4 (AMNH).

Nariiio: Barbacoas (1°38'N, 78°08'W),
8 (amnh).

Valle del Cauca: Puerto Merizalde (3° 16'
N, 77°25'W), 1 (usnm).
COSTA RICA. Alajuela: 18 km NE Naranjo
(9°56'N, 84°57'W), 15 (tcwc).

Cartago: Turrialba (9°56'N, 83°40'W),
11 (lacm), 2 (ku), 32 (tcwc).

Puntarenas: Villa Neily (10°00'N, 84°
50'W), 2 (lacm); San Jose (9°59'N, 84°
04'W), 1 (ku).
ECUADOR. Guayas: Balzar (1°25'S, 79°

54'W), 1 (MNHN).

table 2. Sample statistics and Student's Mests of female Eumops a. auripendulus from the Amazon region of
Brazil and female E. a. major from eastern Brazil and northeastern Argentina

E.

a. auripendulus

E. a. major

Student's

Character

n

Mean

±S.E.

n

Mean

±S.E.

/ value

FOAR

43

58.1

0.21

10

63.4

0.47

10.80***

3DME

47

60.2

0.24

10

65.6

0.60

9.07***

1PHL

46

25.4

0.16

10

27.8

0.43

5.89***

2PHL

47

23.2

0.19

10

25.1

0.18

7.26***

4DME

47

57.9

0.25

10

63.1

0.56

8.77***

1PHL

46

21.4

0.15

10

23.6

0.32

6.14***

2PHL

47

5.5

0.08

10

6.4

0.23

3.81***

5DME

47

32.6

0.16

10

35.8

0.17

13.75***

1PHL

47

17.8

0.13

10

19.1

0.13

7.40***

2PHL

47

5.6

0.08

10

5.7

0.11

1.03 ns

TLEN

6

132.8

2.45

6

142.5

1.71

3.23**

TVER

17

45.2

0.79

7

53.0

2.64

2.85*

HDFT

28

11.0

0.32

9

11.9

0.65

1.25 ns

EARS

21

20.2

0.20

8

21.2

0.63

1.45 ns

TRAG

3

1.8

0.17

6

3.2

0.54

2.35 ns

TIBI

41

16.0

0.12

10

18.1

0.30

7.33***

HTLC

12

4.0

0.05

7

4.6

0.08

J QQ***

HTUC

13

4.1

0.07

7

4.5

0.06

4 27***

WBSP

11

0.6

0.06

9

0.8

0.05

2.56*

LBSP

11

1.8

0.09

9

2.0

0.07

1.71ns

CIMA

10

16.8

0.12

9

18.2

0.14

7.94***

GRLG

13

17.3

0.09

10

18.7

0.09

10.94***

C-M3

13

10.4

0.07

10

11.2

0.09

7.69***

CkC,

12

3.7

0.05

9

3.9

0.04

3.97***

TOLG

11

24.6

0.14

8

26.6

0.29

6.29***

CBLG

10

22.8

0.14

8

24.8

0.19

8.45***

PALA

12

10.9

0.07

10

11.7

0.15

5.22***

ZYGO

9

14.4

0.08

8

15.1

0.11

5.12***

MAST

9

12.3

0.05

8

13.0

0.12

5.23**

LACH

12

7.9

0.08

10

8.4

0.08

3.72**

IOWI

12

7.6

0.08

10

8.0

0.08

3.78**

HBCA

10

8.4

0.06

8

8.9

0.10

4.42***

M3-M3

12

9.9

0.05

10

10.5

0.08

5 95***

C-M3

13

9.4

0.05

9

10.1

0.08

8.43***

C'-C1

11

6.0

0.06

10

6.4

0.05

5.38***

POCO

12

4.6

0.05

9

4.9

0.07

3.20**

BBC1

9

10.7

0.10

6

10.9

0.07

1.59 ns

BBC2

10

11.6

0.07

8

12.1

0.18

2.89*

Manabi: Rio Mongoya (0°10'S, 79° 3 8'

W), 3 (FMNH).

EL SALVADOR. Sonsonate: Chilata (13°

40'N, 89°32'W), 1 (mvz).

FRENCH GUIANA. Cayenne (4°55'N,

52°18'W), 2 (MNHN).

GUATEMALA. Coban (15°28'N, 90°20'
W), 1 (bmnh); Mazatenango (FincaCipres)
(14°32'N, 91°30'W), 1 (amnh).
GUYANA. Demerara: Demerara (George-
town) (6°46'N, 58°10'W), 1 (bmnh).
Essequibo: Rupununi, Kanashen ( 1 °45'

N, 58°30'W), 1 (ROM).

North West District: Arakaka (7°35'N,
60°07'W), 26 (amnh); Mt. Everard, 3
(amnh).

HONDURAS. Copan: Copan (Ruinas de
Copan) (14°52'N, 89°10'W),9 (tcwc).

7 km N Santa Barbara (14°56'N, 88° 11'
W), 1 (tcwc).

JAMAICA, no locality, 1 (bmnh). Kingston
(17°58'N, 76°48'W), 1 (u).
MEXICO. Oaxaca: Mazatlan, District of
Mixes (17°02'N, 95°25'W), 1 (amnh).

Quintana Roo: 16 km from Yucatan bor-
der, 1 (unam).

Tabasco: Teapa (18°35'N, 92°56'W), 1
(bmnh).

NICARAGUA. Mecatepe (11°58'N, 85°
59'W), 1 (usnm). 1.5 km SE Yalaguina
(13°20'N, 86°30'W), 1 (tcwc).
PANAMA. Bocas del Toro (archipelago):
7kmSSWChanguinola(9°28'N, 82°31'W),
1 (usnm).

Canal Zone: Bohio (9°10'N, 79°51'W),
13 (usnm); Empire (9°04'N, 79°40'W),
1 (usnm); Fort Clayton (Fort Kobbe)
(9°00'N, 79°35'W), 2 (usnm); Frijoles
(9°11'N, 79°48'W), 1 (usnm); Gamboa
(9°08'N, 79°42'W), 1 (mvz) ; Panama City
(8°57'N, 79°30'W), 1 (mcz); Paraiso (9°
02'N, 79°38'W), 1 (usnm); Summit (9°
04'N, 79°39'W), 1 (usnm).

Darien: Tacarcuna Village, 1 (usnm).

Panama: Tapia (9°04'N, 79°25'W), 5
(mcz).

PERU. Huanuco: Hacienda San Antonio,
Rio Chinchao (9°30'S, 75°56'W), 2
(fmnh); 3.2 km N Tingo Maria (9°09'S,
75°56'W), 1 (tcwc) ; Vista Alegre (9°55'S,
76°11'W), 2 (FMNH).

Junin: Perene (10°55'S, 75°15'W), 5

(USNM).

Loreto: Pucallpa (8°23'S, 74°32'W), 1
(fmnh).

Piura: 6.4 km W Suyo (4°33'S, 80°01'
W),2 (TCWC).

San Martin: Guayabamba (Santa Rosa de
Huayabamba) (6°22'S, 77°25'W), 4
(amnh).

SURINAM. Commewijne: Slootwijk (ap-
prox. 5°N, 55°W), 1 (rmnh).

Nickerie: Alalapadoo, N of Sipaliwini R.
(approx. 2°30'N, 56°W), 6 (rom). Planta-
tion Wederzorg, not located, 1 (usnm).

Surinam: no locality, 1 (usnm); Parama-
ribo (5°52'N, 55°14'W), 2 (rmnh). Welge-
dacht C, S of Paramaribo, 1 (rmnh).
TRINIDAD. Blanchisseuse (10°47'N, 61°
18'W), 1 (usnm).

VENEZUELA. Amazonas: San Fernando de
Atabapo, Upper Orinoco River (4°03'N,
67°42'W),2 (amnh).

Bolivar: El Dorado, Rio Cuyuni (6°45'N,

61°37'W), 9 (AMNH).

Carabobo: 10 km NW Urama, Rio Yara-
cuy (10°30'N, 68°19'W), 4 (usnm).

Guarico: Parapara (9°44'N, 67°18'W),
1 (usnm).

Zulia: Lagunillas (10°08'N, 71°16'W),
1 (fmnh).

Acknowledgments — I thank the following
curators in charge of mammal collections for
loan of specimens in their care: Dr. Karl F.
Koopman, amnh; Dr. Frank B. Gill, ansp;
Mr. Kenneth Doutt, cm; Dr. Robert S. Hoff-
man, ku; Mr. Thomas H. Farr, i j ; Dr. Donald
R. Patten, lacm; Dr. Barbara Lawrence,
mcz; Dr. Andre Brosset, mnhn, Brunoy; Dr.
Jean Dorst, mnhn, Paris; Dr. James L. Pat-
ton, mvz; Dr. A. M. Husson, rmnh; Dr.
David J. Schimdly, tcwc; Dr. Helio Ferraz
de Almeida Camargo, usp; and Dr. Jose
Ramirez Pulido, unam. I am also grateful
to Mr. John E. Hill, bmnh; Dr. Philip Hersh-
kovitz, fmnh; and Dr. Charles O. Handley,
usnm for the opportunity to examine speci-
mens in their charge. I also thank Dr. B. V.
Peterson, Entomology Research Institute,
Ottawa, who was instrumental in arranging
the loan of specimens from Universidade de
Sao Paulo.

Drs. J.R. Tamsitt and D. Valdivieso read
the manuscript critically, and Dr. R.L. Peter-
son gave valuable advice and counsel. I thank
Mr. Jim Borack for photographic services
and the staff of the Department of Mam-
malogy for their assistance. This study was
supported in part by a National Research
Council of Canada grant to Dr. R. L. Peter-
son and by the Royal Ontario Museum. I
acknowledge the use of the photographic fa-
cilities of the Laboratory of Analytical Sys-
tematics in the Royal Ontario Museum estab-
lished through a grant from the National
Research Council of Canada to the Depart-
ment of Zoology, University of Toronto.

Resumen — El murcielago mastin, Eumops
auripendulus (Chiroptera: Molossidae) tiene
una distribution desde Mexico hasta Argen-
tina. Cierta poblacion del este del Brasil y del
noreste de Argentina difiere morfologica-
mente de E. a. auripendulus. Describo aqui

tales quiropteros como una nueva subespecie, de las 38 caracteristicas mensurales en los

E. a. major, la ciial se encuentra geografica- machos y en 31 de 38 en las hembras. Las

mente aislada de la subespecie de menor ta- caracteristicas que distinguen principalmente

rnano E. a. auripendulus, que se distribuye estas dos subespecies son: la longitud del

desde la cuenca amazonica hasta el sur de antebrazo y del tercer metacarpo; la longitud

Mexico. La localidad tipica de E. a. major condiloincisiva y de la mandibula; la longitud

es Campo Viera (27°15'S, 55°10'W) en de la hilera inferior de dientes; la longitud

Misiones, Argentina. El color del pelaje de mayor y la condiloincisiva del craneo y la

esta nueva subespecie es similar al de E. a. longitud superior de dientes, pero esta ultima

auripendulus pero E. a. major es significante- caracteristica de diferenciacion se aplica sola-

mente de mayor tamano (P < 0.05) en 27 mente a las hembras.

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