a I B RAR.Y OF THL U N I VERSITY Of ILLINOIS 590-5 PI v.3L NATURAL HJSTORV SURVET NATUKAL HISTORY SURVE1 LIPR^RY 44 FIELDIANA . ZOOLOGY Published by CHICAGO NATURAL HISTORY MUSEUM Volume 31 February 23, 1951 No. 44 TWO NEW MAMMALS FROM SOUTHERN PERU Colin Campbell Sanborn Curator, Division of Mammals A recent collection made by Senor Celestino Kalinowski in the Marcapata region of southern Peru contains material representing two undescribed mammals. One of these is a new genus of mar- supials represented by one subadult specimen which is so distinctive that it merits description. The other is a southern race of a bat of the subfamily Emballonurinae. Caluromysiops gen. nov. Type. — Caluromysiops irrupta sp. nov. Characters. — Fur long, dense, and woolly as in Caluromys, but color pattern very different; tail haired on upper side to tip, most of under side entirely naked. Skull like that of Caluromys but molars larger. Caluromysiops irrupta sp. nov. Type. — No. 68336 Chicago Natural History Museum, from Quincemil, Province of Quispicanchis, Department of Cuzco, Peru. Altitude 680 meters. Skin and skull, subadult male. Collected July 11, 1950, by Celestino Kalinowski. Original number 281. Color. — General color of most of upper parts gray, hair near Mouse Gray (Ridgway, 1912) lightened by silvery white tips. Face with faint black markings in front of eyes and on nose. Two separate black lines extending from upper side of front feet along inner side of legs, back over shoulders (where they are widest), down back and over rump to inner side of hind legs and on to upper side of feet. These lines are narrowly continued on sides of basal third of tail and become broad on sides of middle third. Under side gray, with buffy tips to hairs. A faint buffy line down center of belly ending in a large area, near Clay Color, be^rqe^^^q^j No. 663 473 MAP I * ,j61 , . .ui ai II ist ory oudrv«j univkhty of i'.unow Librmy Fig. 87. Caluromysiops irrupta sp. nov. No. 68336 C.N.H.M., type. 474 Fig. 88. Skull of Caluromysiops irrupta sp. nov. No. 68336 C.N.H.M., type. X1H. 475 476 FIELDIANA: ZOOLOGY, VOLUME 31 lower belly. Upper side of tail for basal three-quarters of its length like back but darker. Last quarter of tail creamy white. Under side of tail naked for three-quarters of its terminal length, the naked area a third of the width of the tail basally and the hairs receding on the sides so only the upper third of the tail is haired at its tip. Naked area of tail flesh-colored with fine brownish black markings as found in Caluromys. Ears flesh-colored and thinly covered with white hairs. Toes on left front foot white, those on right foot black. Skull. — The skull is subadult, with milk premolar- in place, m- and mA missing (m- was probably lost in cleaning the skull). The lower jaw has p^ in place, mj just erupting and no mT. The skull has the same form and general shape as that of Calu- romys. The first two upper molars and the first three lower molars are much larger and heavier than those in fully adult skulls of Caluromys. The dental pattern appears to be slightly different but this can not be fully ascertained until an adult is available for examination. The audital bullae are also larger than those of Caluromys. Measurements (skin measurements by collector). — Total length 442 mm.; tail 225; hind foot 39; ear 31. Skull: greatest length 48.4 mm.; condylo-basal length 47.3; palatal length 24.8; length of nasals 19.7; interorbital width 8.9; zygomatic width 27.9; mastoid width 19.3; width of brain case 19.9; upper toothrow c-m- 15.7; length of m— m- 6.1; width of m- 2.9; width of m- 2.9; lower toothrow c-m^ 19.8; length of mj-mi 6.3; width of mT 2.1; width of m^ 1.9. Remarks. — An adult Caluromysiops would probably be as large as or even larger than an adult Caluromys and there might be a greater amount of black on the face, perhaps even circling the eyes. The black pattern in Caluromysiops has a faint parallel in a sub- adult specimen of Caluromys from Panama in which the brownish color starts on the inner side of the forelegs and continues down the back to the hind legs. The naked tail of Caluromysiops suggests a relationship to Glironia but in that genus the under side of the tail is clothed with very short hairs. It is remarkable that this animal has remained undiscovered for so long, as Sr. Kalinowski's father began collecting in the area in the 1880's and his son has continued the collecting. Peropteryx kappleri intermedius subsp. nov. Type. — No. 68349 Chicago Natural History Museum, from Hacienda Cadena, Province of Quispicanchis, Department of Cuzco, SANBORN: TWO MAMMALS FROM PERU 477 Peru. Adult female, skin and skull. Collected August 29, 1950, by Celestino Kalinowski. Original number 377. Characters. — A typical Peropteryx intermediate in size between macrotis and kappleri. Color. — Upper parts Mummy Brown, lighter on under parts. Skull.— hike that of macrotis and kappleri but intermediate in size, perhaps a little closer to kappleri. Measurements of type (two male paratypes in parentheses).— Forearm 49.5 mm. (45.4, 45.6). Skull: greatest length 15.9 mm. (15.3, 15.7); condylo-basal length 14.3 (13.7, 13.9); palatal length 4.8 (4.6, 4.9); interorbital width 2.7 (2.6, 2.9); rostral width 7.0 (6.7, 6.9); zygomatic width 9.5 (9.0, 9.1); mastoid width 8.3 (7.8, 7.9) ; width of brain case 7.6 (6.9, 7.1) ; upper toothrow 6.3 (6.2, 6.2) ; width across canines 3.9 (3.9, 3.9); width across m3— m- 7.1 (6.6, 6.8). Specimens examined. — Type, two males, one female in alcohol. Remarks. — Peropteryx macrotis has been taken in southern Peru at Macchu Picchu in the Department of Cuzco but on the other side of the mountains from Hacienda Cadena. It has also been taken at La Pampa, Department of Puno, north of Cadena. P. kappleri has not been recorded from farther south than Portovelo, in southern Ecuador. The two species occur together in Central America and northern South America. The most marked difference between macrotis and kappleri is one of skull size (greatest length in macrotis 12-15 mm., in kappleri 16.0-17.8). In both the color is a shade of brown. P. k. intermedius is much larger than specimens of macrotis from the same general region and approaches kappleri in size. It probably represents a small southern race of that species.