1892,] NATURAL SCIENCES OF PHILADELPHIA. 335 



Cnemidophorus grahamii B. & G. 



Two specimens of this rare species were obtained by Mr. W. L. 

 Black near the Tule Canyon. The pattern of coloration is like that 

 of C. tessellatus tessellatus, or C. gularis scalaris, except that it has 

 a median dorsal zigzag light stripe. 



Holbrookia maculata B. & G. 



Abundant everywhere, but chiefly on the open prairie. 

 Holbrookia texana Trosch. 



Abundant in rocky ground. 

 Crotaphytus coUaris Say. 



Abundant, generally in rocky ground. 

 Phrynosoma cornutum Harl. 



Abundant, especially on the Staked Plain. Not seen north of 

 Clarendon. 

 Phrynosoma modestum Gird. 



Rather abundant as far as Clarendon ; Tule Canyon. General 

 Pope sent this species to the National Museum from the Staked 

 Plain, and once from the head-waters of the Colorado, of Texas, but 

 I had no expectation of finding it so widely distributed on the east- 

 ern side of the Staked Plain. It is a species of the Sonoran fauna, 



OPHIDIA. 



Contia episcopa episcopa Kenn. 



From the Colorado to the Salt Fork of the Red River ; not very 

 common. In life the vertebral line is orange colored. 



Contia episcopa isozona Cope. 



One specimen from Tule Canyon ; W. L. Black. 

 Ophilobus getulus sayi Holbr. 



One specimen from Tule Canyon ; W. L. Black. 

 Pityophis sayi sayi Schleg. 



The largest snake of the region and generally distributed. 

 Bascanium flagelliforme Catesby. 



The most abundant snake of the country. Although bellig- 

 erent when attacked, this species soon becomes perfectly tame, and 

 seems to be subject to some kind of hypnotization. The head is 

 held rigidly forward at an angle with the body, and it is difficult to 

 make it modify the position. 



