184. HOMALOORANITTM. 213 



'Shield. Body cylindrical ; scales smooth., without pits, in 15 rows ; 

 Tentrals rounded. Tail moderate or short ; suhcaudals in two rows. 

 Southern North America ; Central America ; Tropical South 

 America. 



Synopsis of the Species. 



I. Erontal not more than twice as broad as the posterior border of 

 the supraocular ; seven upper labials ; two postoculars. 



A. Prontal hexagonal. 

 1. Ventrals 120 or more. 

 a. Two pairs of chin-shields. 



a. Kostral much broader than deep ; frontal considerably 

 longer than broad. 



* Eye about half as long as the snout. 



t Frontal not more than once and a half as long as 

 broad ; suhcaudals 46-71. 

 Pirst lower labial usually in contact 



with its fellow ; seven upper labials ; [p. 215. 



body uniform or with dark stripes . . 1. melanocephalwm, 

 First lower labial in contact with its 



fellow ; seven upper labials ; body 



with dark transverse spots or bars . . 2, annuTatum, p. 217. 

 Symphysial in contact with the anterior 



chin-shields ; eight upper labials ; body 



with three light stripes 3. trilineaium, p. 217. 



tt Frbntal twice as long as broad ; suhcaudals 85. 



4. hngifrontale, p. 218. L^ 



** Eye not half as long as the snout. 



t Posterior nasal in contact with or narrowly 

 separated from the prseocular. 



Ventrals 138-158 ; suhcaudals 40-58. . 5. eoronatum, p. 218. 

 Ventrals 149-179 ; suhcaudals 59-70. . 6. rubrum, p. 219. 



ft Posterior nasal very small and widely separated 



from the prseocular . . 7. semicinctwm, p. 219. i^' 



/3. Kostral a little broader than deep. 



* First lower labial broadly in contact with its feUow ; 



eye not half as long as the snout. 



Frontal considerably longer than broad . 8. fuscum, p. 220. 



Frontal scarcely longer than broad 9. houlengeri, p. 221. 



** First lower labial separated from or narrowly in 

 contact with its fellow, 

 t Eye not half as long as the snout ; ventrals 121- 

 135 ; suhcaudals 32-38. 



10. sehistosum, p. 221, 



