434 PROCEEDINGS OF THE ACADEMY OF [1893. 



occasional red patch on the lower abdomen and tail. A dark blotch 

 on the parietals, frontal and superciliaries. In all details of scutellation 

 these specimens agree with A. angulifer of Cuba and are precisely 

 similar in color to five other specimens which were in possession of 

 the dealer from whom they were procured. 



The form is that described by Garman as A. caymanus (Proc. 

 Am. Phil. Soc. , 1887, p. 276) in which the color variation seems to 

 be well fixed. One specimen of A. angulifer in the Academy's 

 collection rather tends towards it, however, and it seems best to re- 

 gard the form as a subspecies from some of the outlying keys and 

 islands. 

 Helicops angulatus (Linn). 



One specimen from Trinidad (O'Reilly, coll.) ; 19 rows of scales ; 

 keeled; loreal 'present ; temporals, 1-3; veutrals, 119; subcaudals, 

 65 pairs ; anal divided. Total length, 368 mm. (tail 89). 



Color greenish olive. The light cross bands widen and end in a 

 red spot on the flanks. Underneath, orange, with a row on each side, 

 of alternating dark blotches. 

 Scytale neuwiedi D. & B. 



One specimen from Guiana (O'Reilly, coll.); 19 rows of smooth 

 scales; 8 superior labials, fourth and fifth in orbit; 8 lower labials; 

 2 nasals, posterior large ; a loreal which is long and narrow, hard to 

 distinguish from the prefrontals; 1 ante, 2 post-orbitals ; temporals, 

 1-2; ventrals, 188; subcaudals, 83, undivided; anal undivided. 

 Total length, 914 mm. (tail 229). 



Color, uniform reddish brown above, pearl white beneath ; lustrous 

 and opalescent. 

 Bothrops atrox (Linn). 



Two specimens from British Guiana, (O'Reilly, coll.) 



(a) 27 rows of scales ; 7 upper and 8 lower labials ; ventrals, 196; 

 subcaudals, 42 pairs. Total length, 635 mm. (tail 89). 



(b) 27 rows of scales; 7 upper and 9 lower labials; ventrals, 195; 

 subcaudals, 59 pairs. Total length, 722 mm. (tail 121). 



Scales broad and with a high, short keel, which does not extend to 

 the tip of the scale. 



Color, grayish olive with brown, black edged blotches on the back, 

 widening on the sides. Interspaces along the back, about equal in 

 length to the blotches. Abdomen yellow, heavily blotched with 

 dark brown. 



