ANTILOCAPRA. 15 



side of neck drab-gray; chest and anterior portion of abdomen fawn 

 color, posterior portion white; inner side of thighs white; a white 

 spot on upper lip; tail above cinnanion-rufuous, beneath white; 

 feet brownish drab. Ex type United States National Museum. 



Measurements. Total length, 1.114; tail, 130. Skull: Total 

 length, 184; occipito-nasal length, 162; Hensel, 162; zygomatic width, 

 80; intertemporal width, 41; palatal length, 107.4; length from arch 

 to incisive foramina, 71.7; length of nasals, 59.5; length of upper 

 molar series, 51.7; length of mandible, 141.3; length of lower molar 

 series, 59. Ex type in United States National Museum. 



Family Antilocapridse. Antelopes. 

 Genus Antilocapra (43). 



Antilocapra americana peninsularis Nelson. 



Antilocapra americana peninsularis Nelson, Proc. Biol. Soc. Wash., 

 XXV, 1912, p. 107. 



Type locality. 45 miles south of Calmalli, Lower California, Mex- 

 ico. 



Genl. Char. Horns shorter, rough; molar series heavier than in 

 A. americana; slight differences in color of pelage. 



Color. Compared with A. americana. Like that species, but the 

 black border on terminal half of ears is broader, and the terminal third 

 of the outer side of ears is blackish, the tips being pure black; rufous 

 area on top of tail extends forward as a well-marked bar dividing the 

 white rump-patch. Size of the two forms about the same. Ex type 

 in United States National Museum. 



Measurements. Skull: total length, 287; occipito-nasal length, 

 237; Hensel, 249; length of nasals, 107.3; length of upper tooth row, 

 69.7; length from palatal arch to incisive foramina, nS.i; length of 

 mandible, 173; length of lower tooth row, 72.8. Ex type in United 

 States National Museum. 



I cannot perceive any characters sufficient, in my opinion, to sepa- 

 rate this animal from typical americana. Those mentioned by Mr. 

 Nelson, both of color of coat and difference in skull, are individualistic 

 rather than specific, and on comparing the type skull with those of 

 typical americana, the molar series are not found to be any heavier. 

 I therefore regard peninsularis as the same as americana of which it 

 would be a synonym. 



