32 



species from which they have been derived. The collection of the Biologi 

 cal Survey contains specimens of C. estor from the Mohave Desert, Death 

 Valley, the Panarnint and Inyo ranges, Owens Valley, the San Juan in 

 south east Utah, Flowing Springs and Humboldt Wells, Nevada, and Playa 

 Maria Bay, Lower California. The latter are not typical. 



Measurements. Type specimen, $ adult: total length, 1052; tail verte 

 brae, 300; hind foot, 179. Measurements of an adult male from Granite 

 Well (base of Pilot Knob), Mohave Desert: tail vertebrae, 340; hind 

 foot, 195. 



Cranial measurements. Type skull, 9 ' basal length, 159; basilar length 

 of Hensel, 155; zygomatic breadth, 89; mastoid breadth, 57; palatal 

 length, 84 ; length of upper carnassial, 17.2 



Canis ochropus Eschscholtz. 

 Canis ochropus Eschscholtz, Zool. Atlas, IIF, pp. 1-2, pi. 11, 1829. 



Type locality. 'California.' (Specimens from Tracy, San Joaquin 

 County, California, assumed to be typical.) 



Characters. Externally similar to C. latrans and lestes, but smaller, 

 darker, and much more highly colored, with very much larger ears, and 

 very much smaller skull and teeth. 



Color. Muzzle dull grizzled cinnamon rufous ; top of head grizzled 

 grayish fulvous ; ears rich fulvous ; nape sometimes fulvous ; rest of upper 

 parts buffy-ochraceous, profusely mixed with black hairs ; under parts 

 usually whitish, with a soiled yellowish wash across middle of belly, but 

 sometimes suffused with pale fulvous ; long hairs of throat strongly grix- 

 zled with black-tipped hairs, forming a conspicuous ' ruff,' the black- 

 tipped hairs sometimes following the median line over the breast; fore 

 and hind legs and feet dull fulvous all round, but paler on inner side and 

 most intense on outer side of hind leg; upper side of forearm strongly 

 marked with black ; outer side of thighs strongly grizzled with black- 

 tipped hairs; underside of tail pale fulvous, white basally, and tipped 

 and edged with black ; hairs of terminal third of under side of tail usually 

 black tipped ; extreme tip often white. 



Cranial and dental characters. The skull of Canis ochropus is dispropor- 

 tionally large for the size of the teeth, and the rostrum is long and slender. 

 Compared with C. estor, probably its nearest relative, the skull is slightly 

 larger, the rostrum decidedly longer and more slender, and the teeth very 

 slightly larger. Compared with its neighbor, C. lestes, with which the 

 skull agrees essentially in length, the entire cranium is narrower, par 

 ticularly the rostrum, and the lateral teeth are so much smaller as to need 

 no comparison. 



Measurements. Average of four females from Tracy, California: total 

 length, 1110; tail vertebse, 295; hind foot, 180. 



Cranial measurements. tf adult, Tracy, California: basal length, 177; 

 basilar length of Hensel, 174 ; zygomatic breadth, 94 ; palatal length, 98 ; 

 mastoid breadth, 62 ; length of crown of upper carnassial tooth, 19. An 



