1-893.] NATURAL SCIENCES OF PHILADELPHIA. 105 



tagonal as in P. inornatus. In flams the coronoid process is short 

 and blunt, in copei it is long and sharply attenuate. The condyle 

 in copei extends far beyond the tip of angle and its upper line is 

 horizontal, instead of oblique, as in flavus. In the latter the ratio 

 of length to breadth of interparietal is 78, in copei it is 62. 



P. copei belongs to the fasciafus group of the sub-genus Perog- 

 nathus. 



Measurements. 3 — Total length, 114; tail, 49; hind foot, 15. 

 Skull, total length, 19*5: basilar length of Hensel, 14-5; greatest 

 mastoid breadth, 1 ; length of nasals, 7 ; interorbital constriction, 

 4-5; length of mandible, 9-7; height of coronoid process from angle, 

 42; ratio of length to breadth of interparietal, 62. 



Remarks. — Dr. Merriam thinks the specimen from Mason, Texas, 

 on which he bases his description and figure of flavus in N. Amer. 

 Fauna, No. 1, may possibly not prove typical. In any case it is 

 evident that copei is in no sense identical with it, either cranially or 

 externally. So far as can be determined from Baird's description of 

 flams there is nothing to prove its dissimilarity to the Mason specimen, 

 whereas copei shows essential differences from either ; first in color, 

 second in color- pattern, third in hairiness of the tail. 



Baird did not define or figure any cranial characters. The 



specimen of copei was taken by its discoverer from the stomach of a 



rattlesnake captured by him on the eastern slope of the Staked Plains 



near the headwaters of the North Fork of the Red River, in Wheeler 



County, Texas. ( )wing to its passage through the snake the specimen is 



probably abnormally long. The skull had been forcibly compressed 



but not enough to prevent its restoration as seen in the figure. 



2. Perognathus lordi (Gray). Abromys lordi Gray. Fro'c. Zool. Soc, London, 

 don, May. 1868, 202. (Duplicate type. No. 447. $ ; Col. S. X. Rhoads; Vernon, 

 head of Lake Okanagan, Bristish Columbia, July 28, 1S92: col. by S. X. R). 



Description. — Size medium, pelage soft, full aud silky, ears rather 

 small, tail slightly longer than head aud body, sparsely and coarsely 

 haired at base, the hairs longer aud more silky toward the slightly- 

 crested- penicillate extremity. Above grayish buff, softly grizzled 

 with black, the individual hairs, as described by Gray, being 

 basally "dark lead color with short gray band and minute 

 (slender) black tip." The feet, lower half of tail, chin, throat, 

 chest and belly and a spot on inferior margin and posterior 



3 All measurements in millimetres. 



