3. LEPTOGNATHUS, 453 
2+43; eight upper labials, fourth and fifth entering the eye; first 
lower labial in contact with its fellow behind the symphysial; four 
pairs of chin-shields, anterior slightly longer than broad. Scales 
in 15 rows, vertebrals strongly enlarged, the largest twice as broad 
as long. Ventrals 185; anal entire; subcaudals 94. Pale brown 
above, with numerous blackish-brown cross-bands, lighter in the 
middle, the anterior as if divided into two; head much spotted and 
aS with blackish ; lower parts whitish, spotted with blackish 
rown. : 
Total length 310 millim.; tail 80. 
Isthmus of Tehuantepec. 
a. Hgr. (V. 185; C. 94). Tehuantepec. M. F. Sumichrast [C.]. 
8. Leptognathus leucomelas, (Pxrare XXIV. fig. 1.) 
Leptognathus leucomelas, Bouleng. Ann. § Mag, N. H. (6) xvii. 
1896, p. 17. 
Body strongly compressed. Eye large. Rostral a little broader 
than deep, not visible from above; internasals half as long as the 
 prefrontals; frontal as long as broad, as long as its distance from 
the end of the snout, shorter than the parietals; nasal divided ; 
loreal once and a half as long as broad, bordering the eye; no pre- 
ocular; prefrontal entering the eye; two postoculars ; temporals 
1+2; seven upper labials, third and fourth entering the eye; first 
lower labial in contact with its fellow behind the symphysial ; three 
pairs of chin-shields, first longer than broad. Scales in 15 rows, 
vertebrals strongly enlarged, the largest nearly twice as broad as 
long. Ventrals 188; anal entire; subcaudals 85. Dark grey 
above, spotted with black, with black, white-edged annuli, some of 
which are broken on the vertebral line; head blackish, speckled 
with white; belly white, speckled and spotted with black and 
irregularly barred by the black annuli. 
Total length 570 millim. ; tail 130. 
Colombia. 
a. 2 (V. 188; C. 85). Near Buenaventura. Mr. W. F. H. Rosenberg 
[C.]. (Type). 
9. Leptognathus mikani. 
Dipsas mikanii, Schleg. Phys. Serp. ii. p. 277 (1837). 
Anholodon mikaniu, Dum. & Bibr. vii. p. 1165 (1854). 
Leptognathus mikanii, Giiinth. Cat. p. 178 (1858) ; Cope, Proc. Ac. 
Philad. 1868, pp. 108 & 135; Jan, Icon. Gén. 37, pl. vi. fig. 3 
(1870); Giinth. Ann. & Mag. N. H. (4) ix. 1872, p. 49; Bouleng. 
Ann. §& Mag. N. H. (5) xviii. 1886, p. 436. 
oreas, Cope, 1. c. pp. 108 & 109. 
andrei, Sauvage, Bull. Soc. Philom. (7) viii. 1884, p. 146 *. 
garmani, Cope, Proc. Amer. Philos. Soc. xxiv. 1887, p. 60. 
Body feebly compressed. Eye moderate. Rostral broader than 
* Tam indebted to M. Bocourt for notes on the type specimen, 
