COLTTBRID^. — LXXV. 173 



characters taken from the cephalic plates as not available 

 for my purpose. 

 * Dorsal scales caiinated. 

 t Anal plate entire. 



a. Rows of scales 19 to 21 ; ventral plates (gastrosteges) 140 to 



170; general color 3 light sti-ipes on a dai-ker ground; 

 sides usually with spots; mostly viviparous. 



Edt^nia, 5. 

 aa. Rows of scales 29 to 37 ; gastrosteges 200 to 240; general 

 color whitish with a triple series of dark blotches. 



PiTYOPHIS, 7. 



ff xuial plate bifld. 



b. Rows of scales 15 to 17. 



c. Tail about one-third of total length ; gastrosteges 150 to 

 160; urosteges 100 or more ; color clear golden gi-een. 



Cyclophis, 9. 

 ee. Tail much less than one-third of total lengtli ; gastro- 

 steges 125 to 180 ; urosteges 60 or less ; color brown or 

 reddish. 

 d. With one or two faint grayish dorsal stripes and 

 usually a broken dusky band along sides; small 

 species: I'ows of scales 15 to 17; loral plate absent; 

 anteorbital present. . . . Stokbria, 4. 

 dd. No dorsal stripe; rows of scales 17; loral plate 

 present; anteorbital wanting. . Haldba, 16. 

 bb. Rows of scales 19 to 21. 

 e. Gastrosteges 130 to 170; general color usually 3 or more 

 dark bands on a lighter gi'ound ; size large. 



Tkopidonotus, 2. 



ee. Gastrosteges 130 to 140 ; general color brown with many 

 obscure black cross-blotches, distinct on neck ; belly- 

 salmon red with a row of black spots on each side ; 



size small Tropidoclonium, 3. 



666. Rows of scales 23 to 29. 

 /. Form short and stout; snout prominent, acute, recurved 

 and keeled, forming a sharp ridge; head flattened 

 when angry; gastrosteges 125 to 150. Hbterodon, 1. 



