174 REPTILES. 



ff. Snout not recurved and keeled ; species of large size. 

 g. Gastrosteges 130 to 155 ; general color 3 series of dark 

 blotches on a lighter ground, sometimes simply 

 barred or uniformly dark or reddish ; aquatic. 



TKOPIDONOTUS, 2. 



gg. Gastrosteges 200 to 235 ; general color brown or black, 



sometimes with quadrate blotches; abdomen usually 



blotched; terrestrial. . . . COLUBER, 8. 



** Dorsal scales smooth. 



\ Anal plate entire ; gastrosteges 175 to 200 color black, brown 



or red, more or less variegated. 

 h. Rows of scales 21 to 25 ; loral plate present. 



OPHIBOLUS, 12. 



lih. Rows of scales 19; no loral plate. . . OSCEOLA, 13. 

 \\ Anal plate bifid; scales in 13 to 17 rows. 

 i. Gastrosteges 170 to 210; scales in 17 rows; snakes very 

 large or very long ours lustrous pitch black in color 



when adult BASCANIUM. 6. 



ii. Gastrosteges less than 170; snakes of medium to small size. 

 j. Scales in 13 rows; gastrosteges 120 to 135; brown, salmon 

 color or yellowish beneath. . CARPHOPHIOPS, 18. 

 jj. Scales in 15 to 17 rows. 



fc. Color black, unstriped; a distinct yellowish ring about 



neck ; gastrosteges 140 to 160. . DIADOPIIIS, 11. 



Kk. Color clear bright green; no collar; gastrosteges 130 



to 140 CYCLOPHTS, 10. 



Wfk. Color brownish, with black dots; no collar; gastro- 

 steges 115 to 125 VIRGINIA, 17. 



\\\ Anal plate bifid ; scales in 19 rows ; gastrosteges, 170 to 185. 



I. Bluish black with squarish red spots on the blanks ; abdomen 



red with black spots FARANCIA, 14. 



II. Blue-black, with three red lines; abdomen yellowish with 



a series of dark spots ABASTOR, 15. 



/. HETERODON, Beauvais. SPREADING ADDERS. 

 1. H. platyrhinus, Latreille. BLOWING VIPER. HOG- 



