22 COLT7BBID-B. 



closely speckled or powdered with brown. Adult uniform dark 

 olive-brown. 



Total length 1500 millim. ; tail 400. 



Guianas and Amazons. 



a. 9 (V. 201 ; C. 129). British Guiana. Demerara Museum. 



b. Yg. (V. 200; C. 125). Surinam. 



c. $ (V. 207 ; C. 120). Peruvian Amazon. Mr. E. Bartlett [C.]. 



6. Phrynonax eutropis. (PLATE I. fig. 1.) 



Spilotes fasciatus, part., Giinth. Ann. Sf Mag. N. H. (4) ix. 1872, 

 p. 20. 



Rostral broader than deep, just visible from above ; internasals 

 as long as the praefrontals ; frontal slightly longer than broad, as 

 long as its distance from the end of the snout, as long as the 

 parietals ; loreal longer than deep ; one praeocular, forming a suture 

 with the frontal ; two postoculars ; temporals 2 + 2 ; eight upper 

 labials, fourth, fifth, and sixth entering the eye, eighth very long ; 

 seven or eight lower labials in contact with the anterior chin- 

 shields, which are much shorter than the posterior. Scales in 25 

 rows, the dorsals very strongly keeled, the keels forming continuous 

 raised lines in the middle of the body. Ventrals very obtusely 

 angulate, 191 ; anal entire ; subcaudals 126. Uniform brown 

 above ; upper lip and anterior lower surfaces yellow ; belly turning 

 to olive-brown towards the tail. 



Total length 1450 millim. ; tail 430. 



Habitat unknown. 



. c? (V. 191 ; C. 126). ? 



7. Phrynonax chrysobronchus. 



Spilotes chrysobronchus, Cope, Journ. Ac. Philad. (2) viii. 1876, 

 p. 136, pi. xxviii. fig. 11 ; Itocourt, Miss. Sc. Mex., .Rent. p. 695 

 (1888). 



Rostral as deep as broad ; internasals nearly as long as the pra- 

 frontals ; frontal about once and two fifths as long as broad, as long 

 as its distance from the end of the snout, as long as the parietals ; 

 loreal longer than deep ; one prseocular, nearly touching the frontal ; 

 two postoculars ; temporals 2+2 ; seven upper labials, third, fourth, 

 and fifth entering the eye, last very long ; seven lower labials in 

 contact with the anterior chin-shields, which are nearly as long as 

 the posterior. Scales in 25 rows, all smooth except the row next 

 to the vertebral, which is weakly keeled. Ventrals 220 ; anal 

 entire; subcaudals 117. Brown, the scales dotted with lighter; 

 head darker ; one or more borders of the scales black ; upper lip, 

 throat, and anterior part of belly yellow ; remainder of lower sur- 

 faces passing from brown to black below the tail. 



Total length 1670 millim. ; tail 422. 



Coast of Costa Rica. 



