MAMMALS OF THE MEXICAN BOUNDARY. 



179 



Kygomatic process of the squamosal (fig. 13a) is straighter than 

 in other species, lacking the sharp elbow seen in the hemionus group. 



Fig. 13.— Odocoileus couesi. a, Skui.i., lateral view (Cat. No. 69229, U.S.N.M.;; b, auditory 

 BULLA. (Cat. No. 37086, U.S.N.M.) 



The base of the vomer is not fused throughout, but free posteriorly 

 (fig. 19^). The horns (fig. 14) are rather stout, but short. 



(Jriinial mcasureiiieiil.i of 8 .■<j)ccbiieiis of Odocoileua /■ouc.ni." 



a All are adults in which the permanent premolars are considerably worn. 



I'he renewal of the horns. — The first young horns of a tWo-year-old 

 buck (No. ffflJ, U.S.N.M., Cloverdale), killed July 15, were covered 

 with fresh velvet, and measured 51 mm. in length. Another in the 

 second year (No. ||m, U.S.N.M.) had hard, polished spike horns 

 95 mm. in length when killed, November 27. An adult male (No. 

 59928, U.S.N.M.), killed August 29, had vascular horns only 110 mm. 

 high. An old male (No. 20686), taken September 5. 1892, had horns 

 in mature velvet. Two adults, killed September 8. 1893, had large 

 horns in velvet just beginning to rub off. Another old male (No. 

 mil, U.S.N.M.), killed October 1, had fully grown horns, but still 



