COLUBRID^. — Lxxy. 173 



characters taken from the ceplialic plates as not available 

 for my purpose. 

 * Dorsal scales cariuated. 

 f Anal plate entire. 



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

 170 ; general color 3 light stripes on a darker ground ; 

 sides usually with spots ; mostly viviparous. 



EUT^NIA, 5. 



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

 color whitish wdth a triple series of dark blotches. 



PiTYOPHIS, 7. 



ff iTLual plate bifid. 



h. 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 green. 



PHYLLOPHILOrHIS, 9. 



cc. Tail much less than one-third of total length ; gastro- 

 steges 125 to 130 ; urosteges GO or less ; color brown or 

 reddish. 



d. With one or two faint grajdsh dorsal 'stripes and 

 usually a broken dusky baud along sides; small 

 species: rows of scales 15 to 17; loral plate absent; 

 anteorbital present. . . . Stokeria, 4. 



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

 present; anteorbital wanting. . Haldea, 16. 



lib. Rows of scales 19 to 21. 



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

 dark bands on a lighter ground; 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 sjiots on each side ; 

 size small Tkopidoclonium, 3. 



hhh. Rows of scales 23 to 29. 



/. Form short and stout ; snout prominent, acute, recui'vcd 

 and keeled, forming a sharp ridge; head flattened 

 wdien angry; gastrosteges 125 to 150. Hetehodon, 1. 



