CROCODILIANS, LIZARDS, AND SNAKES. 



781 



have Thrasops and PhUoihamnus. In tropical America Leptophis is the 

 arboreal representative. We pass from the ground snakes to tbe tree 

 snakes by ]Ter2)eto<lri/as and Cyvlophis in America. 



Tbe following is the geographical distribution of the genera above 

 enumerated: 



LIOPELTIS Cope. 



TAopcltis Cope, Proc. Acad. Nat. Sci. Phila., 1860, p. 55!); Bull. V. S. Nat. Mus., 



No. 32, 1887, p. 56. 

 Chlorosoma Baird and Girard (Wagler), Cat. N. Amer. Kept., Pt. 1, Serp., 1853, 



p. 108 ; not of Wagler. 



Head distinct, scuta normal. Rostral plate not modified; one nasal. 

 Teeth equal. Anal and caudal scuta divided. Scales smootb, unifos- 

 sate (in L. vernalis). 



This genus includes colubriform species with a single nasal plate 

 perforated by tbe nostril, with divided anal i)late, and with oinooth 

 scales. They are of small and medium size, and are frequently of 

 green cg1o:\ The headquarters of tbe genus is in Eastern Asia and 

 India, no species existing in P^uropo or Africa, and but one in North 

 America. Typical Asiatic species are the L. tricolor Schlegel, L. cala- 

 maria Giinther, and L. major Giinther. 



In North America the genus ranges the entire realm excepting the 

 Pacific and Sonoran regions. 



But one species is known in our fiiuna. 



Scales in 15 rows; superior labials 7; postoculars 2; temporals 1-2; green above; 

 labials and below, pale yellowish green ; rather small L. vernalis. 



