300 



COLTJBEIDiE. 



112. ATRACTUS. 



Atractus, Wagler, Isis, 1828, p. 741. 



Brachyorrhos, part., Wagler, Syst. Amph. p. 190 (1830). 



Calamaria, part., Schleg. Phys. Serp. ii. p. 25 (1837). 



Rabdosoma, part., Bum. <§• Bibr. Mem. Ac. Sc. xxiii. 1853, p. 440, 



and Erp. Gen. vii. p. 91 (1854) ; Gunth. Cat. Col. Sn. p. 10 (1858) ; 



Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 10. 

 Isoscelis, G'dnth. I. c. p. 204. 

 Adelphicos, Jan, I. c. p. 18 ; BocouH, Miss. Sc. Mex., Rept. p. 553 



(1883). 

 Rhegnops, Cope, Proc. Ac. Philad. 1866, p. 128. 

 Rabdosoma, Bocourt, I.e. p. 538. 



Fig. 22. 



Skull of Atractus crassicaudatus. 



Maxillary short, with 8 to 12 teeth ; maxillary and mandibular 

 teeth decreasing in size posteriorly. Head not distinct from neck ; 

 eye small, with round or subelliptic pupil ; nostril between two 

 nasals ; prfEocular usually absent, loreal and prajfrontal entering the 

 eye. Itody cylindrical ; scales smooth, without pits, in 15 or 17 rows ; 

 ventrals rounded. Tail sliort or rather long ; subcaudals in two rows. 



Central and South America. 



Synopsis of the Species. 



I. Symphysial shield separated from the chin-shields. 



A. Loreal not more than once and a half as long as deep. 



Scales in 15 rows ; one postocular .... 1. elaps, p. 302. 

 Scales in 17 rows ; one postocular .... 2. latifrons, p. 303. 



Scales in 17 rows ; two postoculars. 



3. modestus, p. 304. 



