304 coiuBRrD^. 



3. Atractus modestus. (Plate XV. fig. 1.) 



RliaMosoma crassicaudatum (mo?? Dum. 8f Bihr.), Gilnth. Proe. Zool. 

 -S'oc. 1859, p. 411. 



Snout rounded. Rostral rather large, broader than deep, the 

 portion visible from above one third as long as its distance from the 

 frontal ; internasals moderately large, a little broader than long ; 

 frontal as long as broad, as long as its distance from the rostral, 

 shorter than the parietals ; loreal once and a half as long as deep ; 

 two postoculars ; temporals 1+2 ; six upper labials, third and fourth 

 entering the ej-e ; four lower labials in contact with the single pair 

 of moderately large chin-shields, which are separated from the 

 symphysial. Scales in 17 rows. Ventrals 173 ; anal entire ; sub- 

 caudals 38. Uniform plumbeous above, on the sides of the ventrals, 

 and on the subcaudals ; ventrals yellowish in the middle. 



Total length 380 millim. ; tail 50. 



Ecuador. 



a. S (V. 173; C. 38). W. Ecuador. Mr. Eraser [C.]. 



4. Atractus vittatus. (Plate XV. fig. 2.) 

 Rhabdosoma crassicaudatum, part., Gilnth. Cat. p. 11 (1858). 



Snout obtusely pointed. Rostral small, as deep as broad, visible 

 from above ; internasals very small ; prsefrontals as long as broad ; 

 frontal as long as broad, as long as its distance from the rostral, 

 much shorter than the parietals ; loreal thrice as long as deep ; one 

 (or two) postoculars ; temporals 1 + 1 ; eight upper labials, fourth, 

 fifth, and sixth entering the eye ; two pairs of chin-shields, the 

 anterior rather elongate, in contact with four lower labials, and 

 separated from the symphysial, the posterior two thirds the length 

 of the anterior and in contact along their inner borders. Scales in 

 15 rows. Ventrals 148 ; anal entire ; subcaudals 18. Dark brown 

 above, with four black longitudinal lines, the space between the 

 inner and outer pair lighter, reddish brown ; beUy yellow, much 

 spotted with black ; two black stripes along the lower surface of 

 the tail. 



Total length 405 millim. ; tail 35. 



Venezuela. 



a. $ (V. 148 ; C. 18). Caracas. 



5. Atractus latifrontalis. 



Geophis latifrontalis, Garman, N. Am. Eept. p. 103 (1883), and 



Bull. Essex Inst. xix. 1888, p. 127. 

 Rhabdosoma mutitorques, Coiie, Proc. Amer. Philos. Soc. xxii. 1885, 



p. 384. 

 Geophis mutitorques, Gilnth. Biol. C.-Am., Rept. p. 93 (1893). 



Snout broad, rounded. Rostral broader than deep; internasals 

 small ; praefrontals as long as broad ; frontal broader than long ; 



