life history of one of our least known big game animals. Through the generosity of Mr. Shiras and the kind cooperation of Governor Joseph M. Carey, and State Game Warden D. F. Hudson of Wyoming, a splendid pair of these animals were collected for the Biological Survey in December, 1913, the male serving as the type of the new subspecies.

In consideration of his remarkable work in originating modern methods of flash-light photography of birds and mammals and the interest he has awakened, through this and by his writings, in animal life and its preservation, I take pleasure in offering a well-deserved tribute by naming this fine game animal in honor of George Shiras, 3d.

Alces americanus shirasi subsp. nov.

SHIRAS MOOSE.

Type from Snake River, 4 miles south of Yellowstone Park, Lincoln County, Wyoming: No. 202,973, adult ♂, U. S. National Museum, Biological Survey Collection; collected December 11, 1913, by John Shive.

Distribution. Known from the northern Rocky Mountains, in and about Yellowstone Park in Wyoming, Montana and Idaho. Probably ranges much farther north along the Rocky Mountains, but limits of range unknown.

Subspecific characters.-Differs strongly in early winter pelage from typical Alces americanus from Maine, Nova Scotia and New Brunswick in having the entire top of the back, including upperside of neck, rather pale rusty yellowish-brown, slightly washed on tips of hairs with dusky; ears paler and grayer; hoofs much shorter and smaller.

Description of adult male in early winter pelage (type).—Entire top of back and upper sides, including upper part of neck, rather pale rusty yellowish-brown, palest on neck and slightly darkened along top of back by a thin wash of dusky on tips of hairs; this dorsal rusty brown area shades into the deep black of lower parts of body along middle of sides; the black area of underparts covers all the lower half of the sides of body, the upper part of the front and hind legs and entire underside of body except a dull pale buffy area covering lower abdomen and inguinal region; middle parts of front and hind legs pale dull buffy, becoming dusky brown on lower hind legs and from knee to hoof on front legs; underside of neck mixed black and rusty brown; underside of head much blacker and much less mixed with rusty hairs than underside of neck; upper and lower lips narrowly bordered with grayish white; top and sides of muzzle and sides of head dusky brown, crown paler rusty brown; back of ears pale dull brownish gray; inside or front of ears, pale, slightly buffy whitish.

Measurements of type taken in the flesh.-Total length, 2540 mm.; length of hind foot, 762 mm.; greatest length of front hoof, 130 mm. (same measurement in adult ♂ from New Brunswick, 153 mm.).

Skull-So far as the small series of fully adult skulls available for comparison indicate there are no appreciable cranial differences between typical A. americanus and A. americanus shirasi.

Remarks. A comparison of the type and an adult female topotype of the Shiras moose, with five adult specimens of typical Alces americanus collected during the same time of year in Maine and eastern Canada indicate that the pale brown backs, pale ears and small hoofs of the present form are very constant differences characterizing a strongly marked geographical form. The female topotype of the new form taken the same day as the type has an even paler brown back than the type, especially on the rump, top of shoulders and along the nape; the ears are also paler gray.

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Among some bats recently submitted to the Biological Survey for identification by the authorities of the Kansas University Museum of Natural History, are specimens of an apparently unnamed species of Mimon from Cozumel Island, Mexico. the privilege of describing this species, the type of which has been generously donated to the Biological Survey, I am indebted to Charles D. Bunker, Assistant Curator of Birds and Mammals, Kansas University Museum of Natural History.

Mimon cozumelæ sp. nov.

Type from Cozumel Island, off the east coast of Yucatan, Mexico. No. 203,191, U. S. National Museum (Biological Survey Collection), collected by G. F. Gaumer. Skin and skull of adult.

General characters.-Similar in general to Mimon bennettii (Gray), but color paler, more rusty brown; skull decidedly broader.

Color.-Type: General color of upper parts near sayal brown (Ridgway, 1912), the pelage becoming paler basally; outer side of forearm clothed proximally with short fur of same color as back; under parts wood brown.

Skull.-Broader and more massive throughout than that of M. bennettii, the braincase conspicuously broader, zygomata more widely spreading, especially posteriorly, the sides less nearly parallel; palate broader behind posterior molars; dentition very similar, but individual teeth slightly larger.

Measurements.-Type (dry skin): Length of forearm, 58; tibia, 22.3; foot, 14.9. Skull (type): Greatest length, 26; zygomatic breadth, 14.3; mastoid breadth, 9.8; breadth of palate behind posterior molars, 2.8; maxillary tooth row, 9.6.

Remarks.-Mimon bennettii (Gray) appears in several check lists of North American mammals, including the latest, * although Alston † has Miller, North Amer. Land Mamm., Bull. 79, U. S. Nat. Mus., 1912, p. 37.

↑ Biol. Cent.-Amer., Mamm., 1879, p. 42.

shown how Dobson* was apparently misled into including Mexico in the recorded ranges of the species, and Elliott remarks that "Mimon bennettii, sometimes included in the North American fauna, does not appear to be recorded north of the Isthmus of Panama." The basis for the erroneous record seems to have been the inclusion of the description of Vampyrus auricularis, the type of which really came from Brazil, by Saussure in his "Note sur quelques Mammifères du Mexique," Saussure's species being later identified with Mimon bennettii (Gray) by Peters.§

Comparison with a subadult specimen from Ypanema, Sao Paulo, Brazil, which has been determined by Oldfield Thomas and is assumed to represent typical Mimon bennettii, seems to show that Mimon cozumela is a fairly well-marked species.

Specimens examined.-Eight, from the type locality (seven topotypes in Kansas University Museum of Natural History).

Cat. Chir. Brit. Mus., 1878, p. 492.

† Mamm. Middle Amer. and W. Indies, pt. II, 1904, p. 667.

I Rev. et Mag. de Zool., ser. 2, XII, 1860, p. 487.

Monatsb. Ak. Berlin, 1869, p. 396.