92 COLUBRID, 
3. Leptodira nigrofasciata, (Pxare V. fig. 2.) 
Leptodira nigrofasciata, Giinth. Ann. § Mag. N. H. (4) i. 1868, 
p. 425, and Biol. C.-Am., Rept. p. 169 (1895). 
—— mystacina, Cope, Proc. Amer. Philos. Soc. xi. 1869, p. 151; 
Giinth. Biol. C.-Am. p. 169. 
Sibon nigrofasciatum, Cope, Bull. U.S. Nat. Mus. no. 32, 1887, p. 67, 
and Proc. U.S, Nat. Mus. xiv. 1892, p. 678. 
— mystacinum, Cope, Bull. U.S. Nat. Mus. no. 32, p. 67. 
Rostral twice as broad as deep, just visible from above; inter- 
nasals much shorter than the prefrontals; frontal once and two 
thirds as long as broad, a little longer than its distance from the 
end of the snout, shorter than the parietals; loreal as long as 
deep or a little longer than deep; one preocular, in contact with 
or narrowly separated from the frontal, with or without a small 
subocular below it; two postoculars; temporals 1+2; eight upper 
labials, fourth and fifth or third, fourth, and fifth entering the eye, 
sixth sometimes touching the parietal ; four or five lower labials in 
contact with the anterior chin-shields, which are as long as or a 
little shorter than the posterior. Scales in 19 rows. Ventrals 
170-196 ; anal divided ; subcaudals 56-70. Above with dark brown 
spots or semiannuli separated by narrow whitish ones, the first 
across the occiput; labials black-spotted ; a blackish streak on each 
side of the head, passing through the eye ; lower parts white, 
Total length 480 millim.; tail 100. 
Isthmus of Tehuantepec; Nicaragua. 
a. 6 (V.170; C.70). Nicaragua. Dr. Seeman Fh ( -) 
b. g (V. 196; C.64). Tapana, Tehu- Prof. F. Sumichrast [C.]; 0. 
antepec. Salvin & F. D. 
oh 
ce, 9(V. 188; C. 56). ah! Dr. A. C. Buller [0.]. 
ity. 
4, Leptodira frenata. 
Sibon frenatum, Cope, Proc. U.S. Nat. Mus. ix. 1886, p. 184, & 
xiv. 1892, p. 677. 
Leptodira frenata, Giinth. Biol. C.-Am., Rept. p. 178 (1895). 
Frontal twice as long as broad; loreal subquadrate ; one preocular, 
not reaching the frontal, with a small subocular below it; two 
postoculars ; temporals 142; nine upper labials, fourth and fifth 
_entering the eye. Scales in 23 rows, Ventrals 188; anal divided ; 
subcaudals 69, Black above, with narrow grey cross-bands (one 
scale in width), which may be broken up and alternate on the 
vertebral line; head grey, densely mottled with blackish, occiput 
pale greyish ; a black streak on each side behind the eye; upper 
Jabials with black borders. 
Total length 305 millim. ; tail 66. 
Jalapa, Mexico, 
