172 COLUBRIDA. 
14. Rhadineza serperastra. 
Rhadinza serperastra, Cone, Proc. Ac. Philad. 1871, p. 212, and 
Journ. Ac. Philad. viii. 1876, p. 140. 
Ablabes serperastra, Giinth. Biol. C.-Am., Rept. p. 105 (1893). 
Internasals transverse, narrow ; frontal wide, supraciliary suture 
shorter than anterior, total length exceeding that of common 
parietal suture; loreal square; one pre- and two postoculars ; 
temporals 1+ 2; eight upper labials, fourth and fifth entering the 
eye; chin-shields subequal. Scales in 19 rows. Ventrals 164; 
anal 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 Rica. 
15. Rhadinega affinis. 
Dromicus affinis, part., Giinth. Cat. p. 128 (1858). 
? Enicognathus melanocephalus, part., Jan, Arch. Zool. Anat. Phys. 
li. 1863, p. 269, and Icon. Gén. 16, pl. 1. fig. 4* (1866). 
Coronella iheringii, Bouleng. 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 
prefrontals ; 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 pre- 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 34 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. . 
