304 COLUBRID 2®. 
3. Atractus modestus. (Prate XV. fig. 1.) 
Rhabdosoma crassicaudatum (non Dum. § Bibr.), Giinth. Proc. Zool. 
Soc. 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 14-2; six upper labials, third and fourth 
entering the eye; 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. 3 (V. 178; C. 38). W. Ecuador. Mr. Fraser [C.]. 
4. Atractus vittatus. (PratEe XV. fig. 2.) 
Rhabdosoma crassicaudatum, part., Giinth. Cat. p. 11 (1858). 
Snout obtusely pointed. Rostral small, as deep as broad, visible 
from above; internasals very small; prefrontals 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; tw» 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; subeaudals 18. Dark brown 
above, with four black longitudinal lines, the space between the 
inner and outer pair lighter, reddish brown; belly yellow, much 
spotted with black ; two black stripes along the lower surface of 
the tail. 
Total length 405 millim. ; tail 35. 
Venezuela. 
a. 9 (V. 148; C. 18). Caracas. 
5. Atractus latifrontalis. 
Geophis latifrontalis, Garman, N. Am. Rept. p. 103 (1883), and 
Bull. Essex Inst, xix. 1888, p. 127. 
Rhabdosoma mutitorques, Cope, Proc. Amer. Philos. Soe. xxii. 1885, 
p- 384. 
Geophis mutitorques, Giinth. Biol. C.-Am., Rept. p. 98 (1893). 
Snout broad, rounded. LRostral broader than deep; internasals 
‘small; prefrontals as long as broad; frontal broader than long ; 
