Nov 51 

 1923 J AMARAL — NEW GENERA AND SPECIES OF SNAKES 101 



series of scales; 8 upper labials, 2d forming the anterior border of the loreal 

 pit, 8th very low; 11 or 12 lower labials; symphysial separated from the 

 only pair of chin shields by the first pair of lower labials. Scales in 25 rows, 

 strongly keeled, the keels lower and longer than those of B. atrox (L.); 

 ventrals, 164; anal entire; subcaudals, 52 pairs. 



Yellowish gray above with brownish black quadrangular markings 

 alternate, or sometimes connected, with those of the opposite side, and 

 having an intermediate series of single, small, round and dark spots; an- 

 other series of double, larger, round and dark spots is present between the 

 quadrangular markings and the side of the ventrals; no marking on the head 

 and no streak from the eye to the angle of the mouth; belly yellowish, 

 slightly speckled with brown in the middle and blotched with black on the 

 sides. 



Total length, 772 mm.; tail, 100 mm. 



Type, adult d\ in very good condition, no. 3010 in the collection of the 

 Institute de Butantan, Sao Paulo, Brazil, collected in Bahia, Brazil, and 

 sent in September, 1921, by Professor Piraja da Silva, director of the branch 

 of Butantan in that State. 



The British Museum has a specimen which practically agrees 

 in every point with the type of B. neglecta, though Boulenger ' 

 has identified it with B. atrox. It is the specimen X of Boulen- 

 ger's Catalogue. It was sent to the British Museum by the Dem- 

 erara Museum, and is said to have been collected in British 

 Guiana, which is probably not so. It has Sc. 24, V. 159, C. 

 47 p., instead of Sc. 25, V. 161, C. 47 p., as Boulenger had 

 found. 



If we consider carefully all the other specimens identified 

 with B. atrox in Boulenger's Catalogue, we find that they have 

 V. 176-216, C. 58-77, and so we may observe that Boulenger's 

 specimen does not fall within these limits. It does not seem, 

 either, to be a dwarf specimen of B. atrox, because not only is it 

 shorter than B. atrox, but its scale keels, number of upper labials, 

 size of ventrals (which are well grown) and the disposition of 

 markings also are different from those of this species. 



Moreover, since 1920 I have been engaged in a very meticu- 

 lous re visionary study of B. atrox and its most closely allied 

 species, the results of which will be published in the near future. 



i G. A. Boulenger, Cat. Snakes, 1896, III, p. 539. 



