310 ' COLUBRID. 
15. Atractus crassicaudatus. 
Rabdosoma crassicaudatum, Dum. § Bibr. vii. p. 103 (1854); Jan, 
Arch. Zool. Anat. Phys. ii. 1862, p. 15, and Icon. Gén. 11, pl. 11. 
tie. 1 (1865). 
Rhabdosoma crassicaudatum, part., Giinth. Cat. p. 11 (1858). 
Snout obtuse. Rostral small, nearly as deep as broad, just 
visible from above; internasals very small; preefrontals as long as 
broad; frontal as broad as long or a little longer than broad, as 
long as its distance from the end of the snout, much shorter than 
the parietals ; loreal at least twice as long as deep ; two postoculars ; 
temporals 1+2; seven upper labials (rarely six), third and fourth 
(or third) entering the eye; three lower labials in contact with 
the single pair of chin-shields, which are moderately large and 
separated from the symphysial. Scales in 17rows. Ventrals 146- 
161; anal entire; subcaudals 19-27. Dark purplish brown or 
blackish above and below, with small yellowish spots on the back 
and larger ones on the belly; outer row of scales yellowish; a 
yellowish blotch on each temple. 
Total length 230 millim.; tail 25. Reaches to 420 millim. 
Colombia and Venezuela. 
a. 9 (V. 150; C. 22). Colombia. 
b. Ye. (V. 146; C. 23). Bogota. 
ce. d (V. 147; C. 25). Caracas, 
d, e. Skulls. Caracas. 
16. Atractus duboisi. 
Rabdosoma duboisi, Bouleng. Bull. Soc. Zool. France, 1880, p. 44. 
Snout obtuse. Rostral small, nearly as deep as broad ; inter- 
nasals very small; prefrontals longer than broad; frontal slightly 
broader than long, as long as its distance from the end of the 
snout, shorter than the parietals; loreal thrice as long as deep; 
two postoculars; temporals 142; eight upper labials, fourth and 
fifth entering the eye; four or five lower labials in contact with 
the single pair of chin-shields, which are rather elongate, moderately 
broad, and separated from the symphysial. Scales in 15 rows. 
Ventrals 150-172; anal entire; subcaudals 16-82. Dark brown 
or blackish above, with two longitudinal series of small round 
yellow spots; ventrals dark brown or black in the middle, yellow 
on the sides; subcaudals black. 
Total length 120 millim.; tail 9. Reaches to 335 millim. ; 
tail 25. 
Andes of Ecuador. 
a. Yg. (V. 172; C. 16). Intac. Mr. Buckley [C.]. 
17. Atractus occipitoalbus. 
Rabdosoma occipitoalbum, Jan, Arch. Zool. Anat. Phys. ii. 1862, 
p. 16, and Icon. Gén. 11, pl. ii. fig. 4 (1865). 
