1916.] 



CYNOMYS GUNNISONI GUNNISONl. 



29 



(teeth moderately worn). Collected August 25, 1904, by George P. 

 Engelhardt, on the Brooklyn Institute of Arts and Sciences expedi- 

 tion of 1904 (Museum of Brooldyn Institute No. 437). Skin in good 

 condition, but not made up into a modern study specimen. It is in 

 worn summer pelage, but with freshly renewed coat on the tail. 



Remarks. — The relationship of this distinct species with Cynomys 

 leucurus rather than with 0. gunnisoni is clear. No evidence of inter- 

 gradation with leucurus is found in the material of each form which I 

 have examined, and every specimen of 0. parvidens can instantly be 

 distinguished by its marked reddish coloration. The superficial re- 

 semblance to certain specimens of C. g. zuniensis is striking, but 

 the color of the tail and general skull characters are diagnostic. 

 Specimens of this prairie-dog from many parts of its range and 

 collected at aU seasons, particularly early summer and late fall, are 

 much needed. 



Specimens examdned, — Total number, 46, as follows: 

 XJtali: Buckskin Valley, 18 (including the type ^ and paratype ^) ; Sevier National 

 Forest, 28. 



CYNOMYS GUNNISONI (Baird). 

 [Synonymy under subspecies.] 



Characters. — Smaller than Cynomys leucurus; larger than C. parvi- 

 dens; general coloration darker; tail gray, with white tip and wliite 

 border on the terminal haK (in leucurus and parvidens the terminal 

 half of tail is entirely white). SkuU smaller than in leucurus, larger 

 than in parvidens; differs from both in more broadly spreading maxil- 

 lary arm of zygoma; mastoids smaller and more obliquely placed, 

 rather than in general occipital plane; audital bulljB smaOer; occiput 

 viewed from behind higher and less broadened; inferior rim of angle 

 of ascending branch of jugal averaging less pointed, more rounded, 

 with little trace of special lateral flattened surface. 



Subspecies. — Two subspecies of Cynomys gunnisoni are here recog- 

 nized. The typical race is confined to parts of Colorado and northern 

 New Mexico, while a paler desert form, C. g. zuniensis, ranges from 

 central New Mexico and southwestern Colorado to the San Francisco 

 Mountain region and to the Hualpai Indian Reservation, Arizona. 



CYNOMYS GUNNISONI GUNNISONI (Baird). 

 Gunnison Prairie-Dog. 

 (PI. Ill, fig. 3; PI. IV, fig. 3; PL V, fig. 5; PI. VII, figs. 3, 6.) 



1855. SpermopMlus gunnisoni Baird, Proc. Acad. Nat. Sci. Philadelphia, VII, p. 334, 

 April. 



1857. Cynomys gunnisonii Baird, Gen. Rep. North Amer. Mamm., pp. xxv, 335. 

 1877. Cynomys gunnisoni Allen, Proc. Boston Soc. Nat. Hist., XVI, p. 294 (syn.). 



I Coliection Amer. Mus. Nat. Hist. 



