890 PROCEEDINGS OF THE ACADEMY OF [1899. 



fig. 10). The nape patch is very large, extending back as far as 

 the point reached by the tips of the ears, and even suffusing the 

 fur for a short distance beyond. It also extends on each side of 

 the neck to angle of jaw. Ears gray internally and externally, 

 blackening at tip outside, and margined with whitish. Lower 

 half of ear distinctly paler than crown of head, and wholly with- 

 out dusky shading. Crown of head about like back, but more 

 finely grizzled. Cheeks slightly browner than sides of body, not 

 darker posteriorly than anteriorly. A dull whitish eye ring, nearly 

 interrupted above and below. Chin and upper part of throat 

 white, faintly tinged with plumbeous. Chest and lower throat 

 cream buff. Legs ochraceous buff, the white of belly extending to 

 back of hind feet, and to wrists. Dorsal surface of front feet 

 cream buff. Back of thighs suffused with cream buff. Belly pure 

 ^vhite, faintly tinged with plumbeous. 



Sknll and Teeth. — Having no skulls of Lepus jioridanus audu- 

 boni at hand, I am unable to compare that of the present race with 

 its nearest relative. As compared with that of L. floridantis 

 holzneri (Mearns) the skull as a whole is slightly smaller, the 

 brain case is relatively broader and shorter and the audital bullse 

 are perct^ptibly larger. 



Measurements. — External measurements of type (from fresh 

 specimen by collector) : Total length, 385 ; tail vertebrse, 63 ; 

 hind foot, 85 ; ear from crown, 78. 



Cranial measurements of type: Greatest length, 69; basal 

 length, 56; basilar length, 52; hensehon to posterior edge of bony 

 palate, 26; least (lateral) length of bony palate, 5.4; posterior 

 edge of bony palate to hamular, 16.4; length of incisive foramen, 

 18; width of incisive foramina, 6; zygomatic bi-eadth, 33; inter- 

 orbital breadth (inclusive of supraorbital processes), 19; greatest 

 breadth of brain case, 25; breadth of rostrum at anterior base of 

 zygomata, 16; greatest (diagonal) length of nasals, 29; greatest 

 breadth across both nasals, 13.6; least breadth across both nasals, 

 8.4; depth of brain case at anterior end of basioccipital, 23; 

 diastema, 18.4; maxillary molar series (alveoli), 12.8; mandible, 

 50; diastema, 15; mandibular molar series (alveoli), 13.6. 



Specimens Examined. — Twenty-five, all from the extreme south- 

 ern part of San Diego County, California, and adjacent Lower 

 California. 



