244 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. III. 



flesh color, apical half brownish black ; a tuft of whitish hairs covers 

 the base of ear. Orbital ring black. 



Measurements: Total length, 150; tail vertebrae, 55; hind foot, 

 21 ; ear, 18.5. Skull: total length, 25.5; Hensel, 20; zygomatic 

 width, 13.5; interorbital constriction, 5; length of nasals, 9; palatal 

 length, 10 ; length of upper tooth row, 4; length of mandible, 15; 

 length of lower tooth row, 4. 



This is a pale Onychomys, not exactly resembling any other species. 

 It is about the size of O, macrotis from Lower California, but quite 

 different in color. It is a desert form as well as a mountain-dweller, 

 and ranges from the Morongo Pass through the Mohave Desert to 

 Lone Pine, and is also found on the Coso Range. It is a very pretty 

 species, with its peculiar pinkish and salmon buff coloring. 



PEROMYSCUS. 

 Peromyscus *petraius. Sp. nov. 



Type locality: Lone Pine, Inyo County, California. 



Genl. char.: Similar to P. auripectus, but paler; tail much darker, 

 foot smaller, no pectoral spot. 



Color: Head and uppef parts ochraceous buff lined with black ; 

 side paler; lips, face beneath eyes, lower part of flanks, hands, ahd 

 feet white; base of fur plumbeous; tail hairy, dusky or blackish 

 above, beneath whitish; ears brownish black, base covered by a tuft 

 of ochraceous buff hairs. 



Measurements: Total length, 177; tail vertebrae, 98; hind foot, 

 20.5; ear, 20. Skull: total length, 24; Hensel, 18; zygomatic width, 

 12; interorbital constriction, 4; palatallength, 9; greatest width of 

 brain case, 7; length of upper molar series, 3; length of mandible, 

 angle to tips of incisors, 13; length of lower tooth row, 3. 



This mouse is allied to P. auripectus, Allen, but can be readily 

 distinguished from that species by its paler coloration, darker tail, and 

 smaller foot, the average length of this member in fifteen examples 

 being 20.1. 



Peromyscus parasiticus. Sp. nov. 



Type locality: Lone Pine, Inyo County, California. 



Genl. char.: similar to P. r. pinalis, but larger in all of its dimen- 

 sions. Skull with larger rostrum, longer nasals, broader between 

 orbits, and larger, differently shaped brain-case. 



Color: Top of head and dorsal region dusky cinnamon, becoming 



* TtSTpatoff frequenting rocks. 



