MARCH, 1904. NEW SPECIES OF MAMMALS ELLIOT. 265 



darker than rest of upper parts; nose, nape, and rump buff; 

 bright buff lateral line; upper parts of sides buffy; entire under 

 parts white; hands and feet white; ankles dusky; tail above 

 black, beneath yellowish white; ears dark brown. 



Measurements. Total length, 214; tail vertebrae, 118; hind 

 'foot, 24.5; ear, 24.5. Skull: occipito-nasal length, 28; Hensel, 

 22; interorbital constriction, 4.5; zygomatic width, 13; greatest 

 width of brairicase, 13; length of nasals, 10; palatal length, n; 

 length of upper tooth row, 4; length of mandible, 12; lower 

 tooth row, 4. 



This species while somewhat similar, is larger than P. truii, 

 and in color is paler and has a very much longer tail, longer foot, 

 and shorter ear. These differences are emphasized in a series of 

 truii before me. The coloring of the upper part of the tail is also 

 quite different, for while that of the present form is black, that of 

 truii is dark seal brown. The ears, while large, are considera- 

 bly smaller than those of the species compared, which sometimes 

 reach a length of 29 millimeters. Mr. Heller obtained only 

 three specimens of this mouse, from Mount Pinos, in the 

 vicinity of Fort Tejon, and he writes that it is a rather rare 

 species on the mountains about Fort Tejon. 



Peromyscus *lasius, Sp. nov. 



Type locality. Hannopee Canon, Panamint Mountains, Inyo 

 County, California. 



Geogr. Distr. Panamint and Inyo Mountains, Inyo County, 

 California, and probably other neighboring ranges west of 

 Death Valley. 



Genl. Char. Allied to P. megalotus from Arizona, and P. 

 truii from New Mexico, Arizona, and Nevada. The fur is 

 fluffy and the general color above in adults is pale ochraceous 

 buff, while P. truii is more of a clay color, and P. megalotus of a 

 darker hue. The tail is also much longer, and the skull is 

 heavier, with a longer, differently shaped braincase and longer 

 rostrum. 



Color. Nose and side of face gray, tinged with buff; orbital 

 ring black; top of head and upper part of body pale ochraceous 

 buff, mixed slightly with black on dorsal region; sides and 

 lateral line from beneath eye to root of tail bright ochraceous 

 buff; entire under parts, hands, and feet pure white; under fur 



* laffnx;, woolly; referring to the long, fluffy fur. 





