102 AMARAL — NEW GENERA AND SPECIES OF SNAKES [^ol^vm' 



I started this study in Brazil, where I examined practically all 

 the collections of snakes, and am continuing it at the Museum 

 of Comparative Zoology with cooperation from Dr. Thomas 

 Barbour who kindly facilitated me with access to the collec- 

 tions of this Museum. I also have examined the material in 

 the United States National Museum and in the American 

 Museum of Natural History through the courtesy of Dr. L. 

 Stejneger and G. K. Noble and Mr. A. I. Ortcnburger. 



Having thus so far examined a great number of specimens of 



B. atrox from Mexico, Guatemala, Honduras, Nicaragua, Costa 

 Rica, Panama, Colombia, Venezuela, French Guiana, Trinidad, 

 Tobago, St. Lucia, Martinique, Ecuador, Peru, Brazil and 

 Paraguay, I am able to state that its most important charac- 

 teristics in scutellation are as follows: Sc. 23-33, V. 190-231, 



C. 56-75, Up. lab. 7/7 in about 90 % of the specimens. I can 

 conclude, therefore, that the type specimen I describe here and 

 its paratype in the British Museum are really different from B. 

 atrox. 



Bothrops leptura sp. no v. 



Snout obtusely acuminate, turned up a little at the end, with very slightly 

 raised canthus; eye moderate; rostral narrow, a little deeper than broad; 

 nasal divided; internasals small, separated one from the other by one scale; 

 canthals a little longer than broad, longer than the internasals; supraoculars 

 striated, twice as long as broad; upper head scales rugose, in 7 longitudinal 

 series between the supraoculars; 2 praeoculars, the superior twice as long 

 as deep, reaching the canthus; 3 postoculars; 1 or 2 suboculars, separated 

 from the upper labials by one series of scales; 7 upper labials, second form- 

 ing the anterior border of the loreal pit; temporal scales keeled. Scales 

 strongly keeled, with rounded tip, in 27 rows; keels long and very low. 

 Ventrals, 202; anal entire; subcaudals, 82 pairs. Tail prehensile, very 

 thin and long. 



Greenish gray above with dark light-edged spots disposed vertically and 

 in pairs, separated, or sometimes confluent with those of the other side; a 

 series of round dark spots on each side above the ventrals, which are yel- 

 low, very lightly powdered with darker; head with two dark, light-edged, 

 longitudinal streaks divergent behind the supraoculars, convergent on the 

 occiput and again divergent on the nape; a dark, light-edged band from 



