252 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. III. 



same large mastoids. Like P. formosus it is also on the borderland 

 ot Perognathus and Chatodipus, the mastoids protruding beyond the 

 occiput just enough to retain it in Perognathus. Of the two forms, 

 however, the present one has the mastoids projecting the farthest 

 beyond the occiput, and the bullse in both are large and widely sepa- 

 rated anteriorly. A series of the new species was obtained at Palm 

 Springs, which would seem to be its northern limit, but it evidently 

 goes into Lower California; for one specimen from Mattomi on the 

 edge of the desert, collected by Mr. Heller, and which in my paper 

 on the San Pedro Martir mammals, I had referred to P.fallax, proved, 

 on comparison, to belong to this species. 



Perognathus *elibatus. Sp. nov. 



Type locality: Mount Pinos, Los Angeles County, California, alti- 

 tude 5,000 feet. 



Genl. char. : Size small ; color dark ; tail long. 



Color: Upper parts black and buff, the former color predominat- 

 ing; nose, sides of face, line over eye, and lateral line cream buff; 

 under parts, hands, and feet white; tail, basal half above buff tinged 

 with dusky, remainder dusky, beneath yellowish white ; ears brown, 

 white spot on each side of margin near notch; whiskers black; line on 

 side of nose black. 



Measurements: Total length, 146; tail, 77; hind foot, 20.5; ear, 7. 

 Skull: total length, 22; Hensel, 15; zygomatic width, n; interorbital 

 constriction, 5; mastoid width, 12; greatest width of parietals, 9; 

 length of nasals, 7; palatal length, 8; length of upper tooth row, 3; 

 length of mandible, angle to end of incisors, n ; length of -lower tooth 

 row, 3. 



This is a very distinct species of Perognathus, belonging to the 

 Panamintinus group, but very much darker in color than any other 

 form, being almost black on the upper parts. Mr. Heller obtained a 

 series in a valley on Mount Pinos at an elevation of 5,000 feet, the 

 only place in which the species was found. It dwells among the pines, 

 evidently only at high elevations. 



Perognathus fpericalles. Sp. nov. 



Type locality: Keeler, Owens Lake, Inyo County, California. 

 Genl. char. : Size small ; colors very pale ; ear rather large. 

 . Color: Entire upper parts deep cream buff tinged with reddish, 

 high mountains. 

 very beautiful. 



