334 PROCEEDINGS OF THE ACADEMY OF [1892. 



scute, and in having but a narrow line of contact between the first 

 and second vertebral scuta. It differs from the type of the species 

 in having the pectoral scuta cut off from contact with each other by 

 the posterior direction of the humero-pectoral sutures, which reach 

 the pectoro-abdominal, a character present in all of the adults. It 

 results from this that the gular scute does not extend half way to the 

 end of the median humeral scuta, as it does in the type specimen- 

 Posterior lobe of plastron notched posteriorly. One inguinal and 

 one axillary scutum, in contact with each other. Penultimate 

 marginal scutum twice as high as the last one posteriorly, and 

 encroaching on the pygal and [last costal plates. Nuchal plate 

 small; no trace of dorsal keels, muzzle oblique, the apex projecting. 

 The color of the carapace is olivaceous, and of the plastron brownish- 

 yellow or yellowish-brown. The skin is lead-colored except the jaws, 

 chin, throat, and anterior face of fore legs, which are light-yellow- 

 Male with numerous rather obscure small brownish spots on sides of 

 head and maxillary region. Length carapace 6 , 140 mm. ; width 

 95 mm. length of plastron 110 mm. Length carapace 9 102 mm.; 

 width 76 mm. ; length plastron 92 mm. 



This species is especially abundant in the artificial "tanks" of the 

 cattle ranges, and in temporary pools of rain water. Its muzzle 

 may be frequently seen projecting from the water, and it is an active 

 swimmer. As the pools approach desiccation these turtles make 

 their way over land to other localities. The male in my possession 

 was an inhabitant of a small pool at which we camped for two days, 

 but he took his departure for a more permanent habitation on 

 the day that we left. AVe overtook him on the road, still covered 

 with fresh mud. 



Trionyx emoryi Agass. 



Abundant in all permanent water. 



LACERTILIA. 



Eumeces obsoletus B. & G, 



Not seen living by me, but obtained at Big Sjoring near which 

 place it was said to have been caught. 



Cnemidophorus gularis gularis B. & G. 



Cope, Transac. Amer. Philos. Soc, 1892, p. 43-5. 



The common swift of the country, very abundant, and showing no 

 variation of color. We did not see it north of Holmes' creek, which 

 is a tributary of the Red River south of the Prairie Dog creek. 



