Vol. XXV, pp. 107-108 June 29, 1912 



PROCEEDINGS 



H K I'll R 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW SUBSPECIES OF PRONGHORN ANTELOPE FROM 



LOWER CALIFORNIA. 



BY E. \V. NELSON. 



This subspecies is based on a scries of twelve specimens, all 

 from the type locality and neighboring district, now in the 

 Biological Survey Collection. Comparisons were made with 

 aboul an equal series of mexicana ami an even larger number of 

 (initriniiiii from various pails of the western United States. 



Antilocapra americana peninsularis subsp. nov. 



Type No. 17S,445, adult male, U. S. National Museum, Biological Survey 

 Collection, from t"> miles south of Calmalli, Lower California, Mexico; 

 collected February 4, 1912, by E. W. Funcke. 



Distribution. — Middle Lower California, south to the head of Ballenas 

 Lay in about L'7 north latitude, and north on the west coast to about 

 29 30'; on the -nil side to beyond 32°, to the southern end of the Colo- 

 rado 1 >esert. 



Subsp* rijir characters. — Compared with typical Antilocapra americana 

 from North Dakota the present form agrees in the dark sooty brown facial 

 markings strongly contrasting with the surrounding white and dark 

 reddish-buff areas (facial area distinctly paler in mexicana); ears of 

 peninsularis much darker about tips; in typical americana as well as in 

 mexicana, terminal half of ears bordered with a narrow I. lack line and a 

 leu scattered black hairs on outside (hack), in peninsularis this black 

 border much heavier and terminal third of outside (or hack) mainly 

 blackish, the terminal inch commonly nearly pure black ; in americana 

 rufous area on top of tail extends forward partly dividing white rump 

 patch but usually becoming obsolescent before reaching rufous area on 

 hack; in peninsularis tins rufous hand extends forward forming a 

 strongly marked bar about an inch wide from tail to rufous of hack thus 

 definitely dividing white rump patch ; horns of peninsularis shorter and 

 actually as well as proportionately thicker laterally at base than in 

 americana or mexicana, with the surface, up to prongs, much roughened 

 19— Proc. Biol. Soc. Wash., Vol. XXV, 1912. (107) 



