Yale Peruvian expeditions, 1911-1915,
Publications, v. 40b.

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1921

SMITHSONIAN MISCELLANEOUS COLLECTIONS
VOWJME 63, NUMBER 4

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PRELIMINARY DIAGNOSES OF NEW MAMMALS OBTAINED
BY THE YALE-NATIONAL GEOGRAPHIC SOCIETY
PERUVIAN EXPEDITION

BY
OLDFIELD THOMAS
British Museum

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(Publication 2447)

' CITY OF WASHINGTON
PUBLISHED BY THE SMITHSONIAN INSTITUTION
APRIL 10, 1917

BALTIMORE, MD., U. S. A.

PRELIMINARY DIAGNOSES OF NEW MAMMALS
OBTAINED BY THE YALE-NATIONAL
GEOGRAPHIC SOCIETY PERU
VIAN EXPEDITION
By OLDFIELD THOMAS, British Museum
By arrangement with the authorities of the Yale-National Geo
graphic Society Peruvian Expedition the United States National
Museum has submitted to me for working out the very fine collec
tion of mammals made by Mr. Edmund Heller during the year 191 5.
This material was obtained at localities lying between Lat. 12° 30'
and 130 30' S., Long. 72° and 73" W., in the region of Cuzco, Peru.
The following are preliminary diagnoses of the new forms. A full
account of the collection will be published in due course.
MICRORYZOMYS, subg. nOv.» of ORYZOMYS
Teeth very small. Zygomatic plate not projected forwards.
Genotype. — Oryzo-mys minutus Tomes.
ORYZOMYS (MICRORYZOMYS) AURILLUS, sp. nov.
Near Oryzomys dryas, but color duller and ears longer.
Head and body of type 83 mm.; tail i34;.hindfoot 22.5; ear 15.5.
Skull, greatest length 23.5.
Habitat. — Torontoy.
Type. — Female. U. S. Nat. Mus. No. 194795 ; original number 255.
HESPEROMYS FRIDA, sp. nov.
Large, with comparatively long tail. Supraorbital ridges little
divergent. Head and body of type 102 mm.; tail 91 ; hindfoot 19; ear 18.
Skull, greatest length 26.7.
Habitat. — Chospyoc, 10,000 feet.
Type. — Female. U. S. Nat. Mus. No. 194779; original number 96.
HESPEROMYS CARILLUS MARCARUM, subsp. nqv.
Duller colored than true carillus; tail white above ; soles more
hairy. Smithsonian Miscellaneous Collections, Vol. 68, No. 4 1

NO. 4 NEW MAMMALS FROM PERU  THOMAS 3
MICROXTJS TORQUES, sp. nov.
Near Microxus mimus, but the zygomatic plate broader.
Head and body 102 mm.; tail 94; hindfoot 22.3; ear 17. Skull,
greatest length 28.
Habitat. — Matchu Picchu, 10,000 feet.
Type. — Male. U. S. Nat. Mus. No. 194607 ; original number 276.
LAMA VICUGNA MENSALIS, subsp. nov.
Size slightly less than in true vicugna and teeth much smaller.
Color more strongly fulvous.
Greatest length of skull 240 mm. ; length of molars 45.
Habitat. — Peru and Bolivia ; type from Incapirra, Junin, Peru,
17,700 feet.
Type. — Male. Brit. Mus. No. 97. 10. 3. 18. Coll. J. Kalinowski.
OROLESTES, gen. nov. (COINOLESTID-ffi)
Like Comolestes, but with various differences in dentition, of which
the most noticeable is that the canine is short, double-rooted, and
shaped like a premolar.
Genotype. — Orolestes inca, new species.
OROLESTES INCA, sp. nov.
Dark brown above, rather paler below. Size and general appear
ance about as in C&nolestes fuliginosus.
Head and body 120 mm. ; tail 108; hindfoot 22; ear 15. Greatest
length of skull 33.
Habitat. — Torontoy, 14,000 feet.
Type. — Male. U. S. Nat. Mus. No. 194401 ; original -number 248.