112 coivsmnx. 



Rostral broader than deep, just visible from above ; intemasals 

 shorter than the prssfrontals ; frontal once and one fourth to once 

 and a half as long as broad, as long as its distance from the rostra] 

 or the end of the snout, as long as or a little shorter than the parie- 

 tals ; nasal elongate, divided ; no loreal ; prEsfrontal in contact with 

 the second and third, or second, third, and fourth labials ; one 

 prseoeular, in contact with or not quite reaching the frontal ; two 

 or three postoculars ; temporals 1 + 2 ; eight or nine upper labials, 

 fourth and fifth or fifth and sixth entering the eye ; four or five 

 lower labials in contact with the anterior chin-shields, which are 

 much shorter than the posterior. Scales in 15 rows, all except 

 the outer row more or less distinctly keeled ; scales of middle row 

 more feebly keeled than the one or two on each side of it ; scales 

 on the neck and tail smooth. Ventrals 152-185, feebly angulate 

 laterally ; anal divided ; subeaudals 133-176. 



Total length 2000 minim. ; tail 730. 



Central America, Colombia, Ecuador, Peru. 



A. Green above, the keels brown or black ; yellowish or pale green 

 beneath ; a black streak on each side of the head behind the 

 eye, disappearing in old specimens. 



a. S (V. 152 ; 0. ?). W. Ecuador. Mr. Eraser [C.]. (Type.) 



b-d. Hpr. S (V. 178 ; Cartagena. Capt. Garth [P.]. 



C.147)&yg. (V.174, 



167; C.?, 159). 

 e. $ (V. 173 ; C. 155), Brazil ? 



/. 2 (V. 185 ; C. 170). British Honduras. F. D. Godman, Esq. [P.]. 

 ff. c? (V. 172 ; 0. 169). Stann Creek, British Rev. J. Robertson [0.]. 



Honduras. 

 h. S (V. 182; C. 172). Tabasco. F. D. Godman, Esq. [P.]. 



i. d (V. 180; C.?). Amula, Guerrero. Mr. H. H. Smith [C.J; 



F.D.Godman,Esq.[P.]. 



B. Black above and beneath, chin and throat white. 



a. Hgr. 2 (V. 165 ; C. GuayaquU. (Type.) 



b. Hgr, $ (T. 163 ; C. ? Royal CoUege of Sur- 



140). geons. 



10. Leptophis nigromarginatus, (Plate III. fig. 3.) 



AhEetuUa nlgromarginata, GiXnth. Ann. 8^ Mag. N. H. (3) xviii. 



1866, p. 28. 

 Leptophis marginatus, Ccype, Joum. Ac. Philad. (2) viii. 1876, 



p. 177. 



Rostral broader than deep, just visible from above ; intemasals 

 as long as or a little shorter than the prsefrontals ; frontal once and 

 a half to once and three fourths as long as broad, as long as its 

 distance from the end of the snout, as long as or slightly shorter 

 than the parietals ; nasal elongate, entire or divided ; no loreal ; 



