38 COLORADO COLLEGE STUDIES. 



At Gainesville, as doubtless in Indian Territory, the range 

 of this species and that of T. ornata, Ag., overlap. The 

 T. triunguis, however, keeps mainly to the more or less 

 wooded bottom-lands, as Mr. Ragsdale informs me, while 

 T. ornata, chiefly an open prairie species, is sometimes found 

 in the timber also. 



The specimens of triunguis from Gainesville are larger 

 than those of ornata from the same place; and the high, 

 rounded carapace, with broad, flat, yet abruptly elevated 

 carina on the third and fourth vertebral scutes and bones 

 (usually seen also on the posterior part of the second), the 

 much less transverse second to fourth vertebral scutes, the 

 greyish olive-brown color, sometimes relieved by ornata-like, 

 dark and yellow subradial markings especially upon the ex- 

 centric place of origin of the concentric imbrications, the 

 more depressed skull and orbit and consequently more ob- 

 liquely placed jugal bone, the possession of three claws only 

 on each posterior foot, and the essentially woodland habit, 

 are all peculiarities which distinguish the former species, as 

 from the latter. Both the fore and the hind limbs of the 

 only present example in which the skeleton is preserved have 

 the phalanges 2, 8, 3, 2, 1, those of the fourth and fifth digits of 

 the hind limb being rudimentary and these digits without 

 claws. 



I am also indebted to Mr. Ragsdale for a shell and skull 

 of the Keeled Mud-turtle, Gonioclielys carinata, Gray, and 

 the same of Chryscmys elegans, Wied., which he collected in 

 Elm Fork of the Trinity river at Gainesville. 



Gerrhonotus infernalis, Baird.— Cope has recorded this 

 species from Helotes creek, near San Antonio, and from 

 Wichita county, Texas. It is common in Hays and in the 

 western part of Travis county. In the summer of 1893, I 

 observed it in the Cross-Timbers, between Roanoke and 

 Lewisville, extending its known range somewhat eastward. 



The little burrowing snake, Stenosfoma dulce, B. & G., 

 almost the sole representative of the family Typhopidcv in 

 the United States, was also taken in the Cross-Timbers, at a 



