310 COLUBRID.fi. 



15. Atractus crassicaudatus. 



RaMosonm crassicaudatum, Dum. 4r Bibr. vii. p. 103 (1854) ; Jan, 

 Arc/I, '/.ool. Aiiat. Phi/s. ii. 1862, p. 15, and Icon. G6n. 11, pi. ii. 

 tijr. 1 (1st;.-)). 



Hlmbdosoma crassicaudatum, part., Giinth. Cat. p. 11 (1858). 



Snout obtuse, llostral small, nearly as deep as broad, just 

 visible from above ; internasals very small ; pnefrontals 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 17 rows. Ventrals 146- 

 161; anal entire; stibcaudals 19-27. Dark purplish brown or 

 blackish above and below, with small yeDowish 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. $ (V. 150 ; C. 22). Colombia. 



b. Yg. (V. 146 ; C. 23). Bogota. 



c. c? (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 ; praefrontals 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 1 + 2 ; 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 16-32. 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. 10). Intac. Mr. Buckley [C.]. 



17. Atractus occipitoalbus. 



Uabdosonia occipitoalbum, Jan, Arch. Zool. Anal. I'/iys. ii. 1862, 

 p. 16, and Icon. Gen. 1 1, pi. ii. tig. 4 (1865). 



