1903.] NATURAL SCIENCES OF PHILADELPHIA. 21 



Citellus marginatus (Bailey). 



1902. Spermophilus spilosoma marginatus Bailev, Proc. Biol. Soc. Wash., 

 XV, p. lis, June 2, 1902. (Alpine, Brewster county, Tex.) 



Two specimens from Pecos, Tex., and vicinity of Alamogordo, Otero 



county, N. M., agree perfectly with the description of this form. The 



inference drawn from the occurrence of marginatus in communities 



with arcns is that they represent distinct species, the coloration being 



typical as well as the proportions. The length of the hind feet appears 



to be an excellent diagnostic character. 



Citellus mexicanus parvidens (Mearns). 



1896. Spermophilus tnexicanus parvidens Mearns, Preliminary Diagnoses of 

 New Mammals from the Mexican Border of the United States, p. 1, 

 March 25, 1896. (Fort Clark, Kinney county, Tex.) 



Three specimens of this form are included in the series examined, all 

 being from Pecos, Tex. Two of the specimens are the property of the 

 Academy, the other belonging to the American Museum. Compared 

 with topotypes the Pecos specimens are seen to be identical, and are 

 easily separated from Brownsville specimens, which latter appear to 

 represent true mexicanus. 



Citellus grammurus (Say). 



1823. S[ciurxts'\ grammurus Say, Long's Exped. Rocky Mts., II, p. 72. (Ar- 

 kansas river, at its exit from the foothills, Colorado.) 



A specimen from Rio Ruidoso, Lincoln county, appears to represent 

 the typical form. 



Citellus tridecemlineatus pallidus (Allen)? 



1877. [Spermophilus tridecemlineatus'] var. pallidus, Allen, Monogr. N. Amer. 

 Rodentia, p. 872, August, 1877. (Plains of the lower Yellowstone river.) 



A specimen of the thirteen-lined spermophile from Agua Fria Park, 

 Colfax county, N. M., collected by Emerson Atkins, was submitted by 

 Prof. Cockerell. While by no means true pallidus, still it appears to be 

 closer related to this than to any other form. The condition of the 

 specimen is quite unsatisfactory for conclusive comparison. 



Cynomys arizonensis Mearns. 



1890. Cynomys arizonensis Mearns, Bull. Amer. Mus. Nat. Hist., II, p. 305, 

 February 21, 1890. (Point of mountain, near Wilcox, Ariz.) 



An adult male of this species from the San Augustine plain (or Tula- 

 rosa Valley), near Alamogordo, Otero county, N. M., appears to be abso- 

 lutely identical with the Arizona form. On comparison the skull is 

 found to be identical with representatives of arizonensis from San Luis 

 Springs, Mexican boundary, determined by Mearns. The length of 

 head and body considerably exceeds the maximum given in the orig- 

 inal description. 



This individual was from a small colony of about thirty holes. 



