4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



Westward it connects with true jacksoni in the region west of Lake 

 Baringo. It occurs in very limited numbers, is exceedingly wary and 

 is seldom secured by sportsmen. 



SYLVICAPRA GRIMMIA DESERTI, new subspecies 

 Desert Bush Duiker 



Type from Yoi, British East Africa: adult male, Cat. Xo. 18j.no. 

 U. S. Nat. Mus. ; collected by Edmund Heller, October 27, 1911 ; 

 original number, 2532. 



Characters. — Sylvicapra grimmia deserti is decidedly lighter than 

 the other East African races of bush duikers with more vertically 

 directed horns and shorter pelage. P>ody size large. Dorsal colora- 

 tion huffy without any approach to the tawny color of the highland 

 races and with the dark chin spots obsolete or but faintly indicated. 



Color of the type: dorsal color buff speckled very lightly by nar- 

 row dusky vermiculations to the hair ; underparts white, the breast 

 showing but a slight tendency toward the ochraceous color of hindei. 

 Legs buffy like the body but lacking the darker vermiculation ; from 

 the fetlocks to hoofs solid fuscous-brown which is continued upward 

 in front as an indefinite darker leg stripe. Tail with a median black 

 dorsal stripe, the sides and under surface white in sharp contrast. 

 Head ochraceous marked by a broad seal-brown or black median 

 stripe from the muzzle to the horn bases. Lips, chin, and forethroat 

 white, the chin marked on sides by two faint drab-gray spots repre- 

 senting the blackish patches of hindei. Eye lashes and anteorbital 

 stripe black. Ears on back covered by a short scattered growth of 

 ochraceous hair but general color tone dark brownish due to the 

 dark skin ; inner side and base white. Throat and nape ochraceous- 

 buff, slightly darker than the body. 



Measurements of type in the flesh: Head and body, 810 mm.; 

 tail, no; hindfoot, 2do; ear, 105. Skull, adult, with last molar in 

 place but with milk molars still in use: greatest length, 166; condylo- 

 basal length, 156; greatest breadth, J2\ nasals, 63x30; length of 

 premaxillae, 48 ; vertical diameter of orbit, 26 ; orbit to gnathion, 87 ; 

 tooth row to gnathion, 49 ; length of upper tooth row, 51. Length of 

 horns, straight, 4^ inches; spread at tips, 2^ inches. Angle of 

 horns with profile of dorsal surface of head, 130 . 



Besides the type there are four adult females in the National 

 Museum collected by the Rainey Expedition. Two of these are from 

 Voi, one from Maji-ya-Chumvi, and the other from Mariakani sta- 



