96 AMARAL — NEW GENERA AND SPECIES OF SNAKES ['vol^VIIl' 



only in the anterior third of the vertebral column, and no mental 

 groove, the subfamily Dipsadinae might be connected with 

 the Colubridae genera Petalognathus and Tropidodipsas, some 

 species of which have rather long and posteriorly divergent 

 pterygoids, hypapophyses present only anteriorly, and rudi- 

 mentary mental groove or none at all. 



The Dipsadinae species have spinous hemipenis, 1 vertically 

 elliptic pupil or nearly so, and are arboreal, nocturnal, and 

 snail-eaters. 



Bothrops erythromelas sp. no v. 



Snout short, truncate and broad, with very slightly elevated canthus; 

 eye moderate. Rostral as broad as deep; nasal divided; internasals short 

 and broad, in contact behind the rostral; canthals short and broad, as long 

 as the internasals; upper head scales sometimes enlarged, faintly keeled, 

 in 5 longitudinal series between the supraoculars; subocular incompletely 

 separated from the upper labials by one series of scales; 7 or 8 upper labials, 

 2d separated from the loreal pit; temporal scales keeled; 9 or 10 lower 

 labials. Scales strongly keeled, in 21 series; keel of the scales long and low; 

 ventrals, 144-155; anal entire; subcaudals, 33-35 pairs. 



Reddish brown above with a close series of dark brown or black triangu- 

 lar markings alternate with or opposite to those of the other side, with an 

 intermediate series of small, single and dark spots; head dark brown above 

 and laterally, with some darker dots; belly yellowish, finely speckled with 

 brown, with a series of dark spots on the sides of the ventrals extending 

 to the first two rows of dorsal scales. 



Total length, 520-540 mm.; tail, 55-65 mm. 



Type, adult 9 , no. 3030 in the collection of the Instituto de Butantan. 

 It was collected in January, near Joazeiro, State of Bahia, Brazil, and in 

 October, 1921, was sent alive to me for determination by Professor Pirajd, 

 da Silva, director of the branch of Butantan in that State. 



There are two other specimens of B. erythromelas in the col- 

 lection of Butantan; one of them has the no. 3031, and was pro- 



« E. R. Dunn very recently (Proc. Biol. Soc. Wash., 23, 1923, p. 188) verified that "the 

 hemipenis of Pseudopareas, as determined by P. vagus, is undivided, the sulcus is forked. 

 The proximal portion has small hooks, the distal portion is covered with calyces. There 

 seems to be an ill-defined edge to the calyculate portion, so that the hemipenis is somewhat 

 capitate." 



