Two new beetles from Costa Rica and Australia, with a description of a new genus (Coleoptera, Cleridae)

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NATURAL
HISTORY SURVEY

NATURAL
HISTORY SURVE1

FIELDIANA • ZOOLOGY

Published by
CHICAGO NATURAL HISTORY MUSEUM

Volume 31 JULY 31, 1947 No. 18

Two New Beetles from Costa Rica and Australia

With a Description of a New Genus

(Coleoptera, Cleridae)

ALBERT B. WOLCOTT

ASSISTANT CURATOR, HARRIS PUBLIC SCHOOL EXTENSION
RETIRED FEBRUARY 1, 1942

AND

HENRY S. DYBAS

ASSISTANT CURATOR, DIVISION OF INSECTS

The following descriptions are based upon specimens kindly lent
to the senior author by Mr. J. B. Corporaal of Amsterdam, The
Netherlands. The drawings are the work of Mary Brombacher
Bieri, Antioch College, Yellow Springs, Ohio.

Thriocerodes gen. nov.

Genotype Thriocerodes corporaali sp. nov.

Diagnosis. — Body subcylindrical. Head moderately large;
clypeus short, translucent; labrum short, broadly emarginate at
middle; eyes prominent, convex, coarsely faceted, slightly emargi-
nate anteriorly; last segment of both maxillary and labial palpi
triangular. Antennae eleven-segmented, short, not reaching base
of pronotum ; first segment short, stout, the second similar in shape
but much smaller; third segment slender, one half longer than the
fourth ; segments four to eight decreasing in length, becoming globu-
lar; club three-segmented, nearly symmetrical, rather compact,
ninth and tenth segments transverse, terminal segment rounded, no
longer than broad. Scutellum transverse, posterior margin rounded.
Elytra together about one-half as wide as long, covering tip of
abdomen. Anterior coxae open behind. Abdomen with six visible
sternites, the terminal segment small and rounded. Legs very short
and rather stout; first tarsal segment much shorter than the second
or third (measured from base to dorsal insertion of second segment) ;
tarsal claws angulately thickened at base (fig. 22, e).

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FIELDIANA: ZOOLOGY, VOLUME 31

Remarks. — This genus is placed in the subfamily Korynetinae.
Structurally, Thriocerodes appears to be somewhat similar to Thrio-
cera. Thriocerodes corporaali differs from the type of Thriocera
(T. pectoralis Klug) in possessing coarsely faceted eyes, a nearly

FIG. 22. a, b, Callotillus intricatus sp. nov.: a, antenna, female; b, antenna,
male, c, d, e, Thriocerodes corporaali gen. et sp. nov.: c, antenna; d, terminal
segment of palpus; e, tarsal claw.

symmetrical antennal club, and a different form of tarsal claw
(tooth very large and broad in Thriocera).

Thriocerodes corporaali sp. nov. Figures 22, c, d, e; 23.

Type labeled Peak Downs [Leichardt Province, Queensland,
Australia], Mus. Godeffroy, No. 11373. A specimen of undetermined
sex in the collection of J. B. Corporaal. Collected by A. Dietrich (?).

Paratypes. — Two specimens of undetermined sex, same data as
the type; one each in the collections of Chicago Natural History
Museum and J. B. Corporaal.

Description. — Form robust, subcylindrical, moderately convex.
Color brown; elytral maculations, antennae, mouth-parts, legs, and
under sides testaceous; upper surface sparsely clothed with moder-
ately long, semi-erect, yellow pubescence.

FIG. 23. Thriocerodes corporaali gen. et sp. nov., paratype.
145

146 FIELDIANA: ZOOLOGY, VOLUME 31

Head coarsely, closely punctate, the punctures setigerous, sepa-
rated by less than one- third their diameters; eyes convex, coarsely
faceted, emarginate anteriorly, sparsely haired; labrum short, emar-
ginate at middle, terminal segments of palpi triangular (fig. 22, d);
antennae as in figure 22, c.

Pronotum broader than long, sides curving to greatest breadth
posterior to middle, thence narrowing to base, basal angles obtuse,
basal width almost equal to apical width; disk coarsely, closely
punctate, the punctures setigerous, separated by about one-fourth
their diameters; sides margined from base to apex; basal margin
entire, reflexed; disk grooved across base just anterior to margin,
uneven, with faint median and lateral impressions at middle and at
basal and apical angles (these impressions more distinct on one
paratype).

Scutellum transverse, rounded posteriorly, surface rugose;
elytra together about twice as long as wide, with yellowish lunate
sub-basal and median maculations, and an irregular common apical
maculation; disk with large seriate punctures that become smaller
and less distinct apically; lateral margin of elytra distinct, anteriorly
narrowly reflexed.

Legs short, rather stout; tarsal claws slender. Metasternum and
abdomen finely and sparsely punctate, shining; sparsely pubescent,
the abdominal hairs becoming longer and more closely placed
laterally and apically. Posterior margin of fifth abdominal sternite
truncate; sixth small, rounded.

Length 4.5 mm.

Remarks. — One paratype differs from the type in being of a darker
brown color and in having somewhat more extensive elytral macula-
tions that more closely approach the suture.

This species is named in honor of Mr. J. B. Corporaal, who has
added greatly to our knowledge of this family of beetles.

Callotillus intricatus sp. nov. Figures 22, a, b; 24.

Type from Farm La Caja, 8 km. west of San Jose", Costa Rica.
A female in the collection of J. B. Corporaal. Collected June 12-
July 20, 1924, by Ferdinand Nevermann.

Allotype. — A male, same data as the type, in the collection of
Chicago Natural History Museum.

Description. — Form moderately broad. Color black, clothed
with short, recumbent, gray pubescence except on basal half of

WOLCOTT AND DYBAS: TWO NEW BEETLES

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elytra, which is feebly shining. Basal half of elytra with yellowish
maculations (fig. 24), these consisting of a small subhumeral spot, and
an oblique submedian fascia whose anterior medial end approaches
the posteriorly directed apex of a common, median, V-shaped macu-
lation with hooked ends. Apex of elytra testaceous. Palpi, labrum,

FIG. 24. Callotillus intricatus sp. nov.; type, female.

clypeus, antennae, tibiae, tarsi, terminal two segments of abdomen,
and a narrow area along base and apex of pronotum reddish brown.

Head, including eyes, not wider than pronotum, front closely,
rugosely punctate, covered with short, recumbent, gray pubescence;
eyes deeply emarginate anteriorly. Antennae ten-segmented,
sexually dimorphic. Antenna of female short, not reaching base of
pronotum, form as in figure 22, a. Antenna of male with terminal
segments lacking, form as in figure 22, 6. Terminal segment of
labial palpus conical.

Pronotum longer than broad (16:13), subcylindrical, sides parallel
to basal third, thence narrowing to basal constriction, which is two-
thirds of greatest width; base margined. Disk closely, rugosely

148 FIELDIANA: ZOOLOGY, VOLUME 31

punctate, covered with short, recumbent, gray pubescence, with
longer, erect, black hairs intermixed.

Scutellum with rounded posterior margin, closely punctate,
covered with short, recumbent, gray pubescence. Elytra together
slightly more than twice as long as wide at base; humeri obtusely
rounded; sides parallel on basal third, broadening to apical third,
thence curved to the separately rounded apices; disk of each elytron
elevated at base and slightly inflated on posterior half. Basal macu-
lations of elytra yellowish, of configuration as in figure 24; basal
half of elytra with sparse, semi-erect pubescence that is black on
the dark portions and yellow on the maculations; posterior half of
elytra closely covered with short, recumbent, gray pubescence with
sparse, semi-erect, black hairs intermixed. Disk sparsely and
irregularly punctate.

Under side black, shining. Metasternum and abdomen nearly
impunctate; pubescence fine and very sparse, becoming more
abundant laterally and apically on abdomen; metepisternum, tibiae,
and apices of femora covered with dense, short, depressed, grayish-
white pubescence. Abdomen with six ventral segments, segment five
arcuately emarginate in the male, truncate in the female.

Length: female type 5.5 mm.; male allotype 4 mm.

Remarks. — Callotillus intricatus Wolcott and Dybas appears to
be closest in form and in structure to Callotillus crusoe Wolcott. It
differs from that species in color and pattern, in the absence of
densely pilose elytral tubercles, and in the form of the third antennal
segment (more distinctly triangular in crusoe}.

Judging by the kind of antennal dimorphism present in other
members of the genus, the type of Callotillus crusoe Wolcott is
probably a female, rather than a male as described.