1898.] XATIKAI, SCIENCES OF PHILADELPHIA. 431 



ing rings as distinctly as in the black type. An occasional scale is 

 black or white. Abdomen yellowish cream color with small dusky 

 blotches, especially towards the tail. The whole pattern is less dis- 

 tinct than in the ordinary form and is difficult to describe. 

 Xiphosoma ruschenbergeri (ope. 



Two specimens from Trinidad (a, O'Reilly, coll.) 



(a) 4. rows of scales ; 2 loreals ; 13 superior and 13 inferior 

 labials; 9 to 12 scales between orbits; 4 large plates on muzzle; 

 ventrals, 261 ; subcaudals, 101. Total length, 1,680 mm. (tail 305). 



Color, greenish brown above, with an occasional yellow scale. All 

 the scales narrowly margined with dark brown. Underneath, bright 

 yellow, clouded with dusky. A few small black spots towards the tail. 



(b) 43 rows of scales; 2 loreals ; 14 superior labials, 8 pitted; 13 

 inferior, 7 pitted; 9 to 11 scales between orbits. Six large plates on 

 muzzle. Ventrals, 258 ; subcaudals, 101. Total length, 1,655 

 mm. (tail 305). 



Color similar to specimen a, but without any yellow scales on the 

 body . 

 Xiphosoma annulata Cope. 



(a) Said -to have come from Jamaica, but probably exotic ; 54 

 rows of scales ; 3 loreals; 12-14 superior labials, 6 pitted; 18 in- 

 ferior, 9 pitted; 12 to 16 scales between orbits; ventrals, 260; 

 subcaudals, 82. Total length, 863 mm. (tail 152). 



Color, gray with a series of darker gray rings with lighter centers, 

 on each side. These rings often coalesce across the back, and become 

 bands on the tail. Light gray underneath. Head with a few dark 

 markings and a black band through the eye. 



(b) From Bocas del Toro, Columbia; 54 rows of scales; 3 

 loreals; 14 superior labials, 8 pitted; 18 inferior, 10 pitted; 14 to 

 16 scales between orbits; ventrals, 252; subcaudals, 80, Total 

 length 990 mm. (tail 152). 



Color much as in specimen a, but with a slightly brownish tinge. 



The muzzle in this species is broader than in hortulana, the inter- 

 nasals are shorter and the superciliaries less distinguishable. 

 Dipsas cenchoa (Linn.). 



One specimen from Columbia; 17 rows of scales; median much 

 enlarged ; 1 ante and 2 post-orbitals ; 7 superior, 9 inferior labials ; 

 ventrals, 246; subcaudals, 180 pairs: anal divided. Total length, 

 1, 028 mm. (tail 330). 



