172 COLTTBEID^. 



14. Rhadinsea serperastra. 



Rhadinsea serperastra, Cope, Proc. Ac. Philad. 1871, p. 212, and 



Journ. Ac. Philad. viii. 1876, p. 140. 

 Ablabes serperastra, Ounih. Biol. C.-Am., Rept. p. 105 (1893). 



InterDasals transverse, narrow : frontal wide, supraciliary suture 

 shorter than anterior, total length exceeding that of common 

 parietal suture ; loreal square ; one prae- and two postoculars ; 

 temporals 1 + 2 ; eight upper labials, fourth and fifth entering the 

 eye ; chin-shields subeqnal. Scales in 19 rows. Ventrals 164 ; 

 annl divided ; subcaudals 78. Dark brown, -with six longitudinal 

 yellow or white lines ; head dark brown above, with a pale shade 

 across frontal and two just behind parietals ; labials black, yellow- 

 spotted ; belly yellowish, with a series of dark spots on the ends of 

 the ventrals. 



Costa Eica. 



15. Hhadinsa afBnis. 



Dromious affinis, part., Giinth. Cat. p. 128 (1858). 



p Enicognathus melanocephalns, part., Jan, Arch. Zool. Anat. Phys. 



ii. 186-3, p. 209, and Icon. Gin. 16, pi. 1. fig. 4* (1866). 

 Coronella iheringii, Boukng. Ann. ^ Mag. N. H. (5) xv. 1885, 



p. 194. 



Eye moderate. Snout short ; rostral broader than deep, scarcely 

 visible from above ; internasals broader than long, shorter than the 

 prsefrontals ; frontal about once and a half as long as broad, a little 

 longer than its distance from the end of the snout and shorter than 

 the parietals ; loreal as long as deep or a little deeper than long; 

 one prae- and two postoculars; temporals 1+2, the second upper 

 very long ; seven upper labials, third and fourth entering the eye ; 

 four lower labials in contact with the anterior chin-shields, which 

 are shorter than the posterior. Scales in 17 rows, Ventrals 147- 

 185; anal divided; subcaudals 58-71. Length of tail 3| to 5 

 times in the total length. Grey-brown above ; a black band on 

 each side of the head, passing through the eye, uniting with a broad 

 transverse band on the occiput, covering the posterior half of the 

 parietals ; the rest of the upper surface of the head with black 

 variegations, or almost entirely black ; a triangular light spot 

 behind the eye and two roundish ones close together behind the 

 point of the frontal ; the black occipital band edged with lighter 

 behind; a blackish longitudinal line on the nape, sometimes con- 

 tinued along the back as a vertebral series of small spots ; a roundish 

 dark spot on each side of the nape ; pale yellow inferiorly, with one 

 or two black dots on the side of each ventral and one on each 

 caudal ; a few other minute dots may be scattered on the ventrals ; 

 chin and throat brown, with yellowish, black-edged spots or ver- 

 miculations. 



Total length 710 millim. ; tail 145. 



Brazil. 



