3. LEPiosNAXHrrs. 453 



2+3 ; eight Tipper labials, fourth and fifth entering the eye ; first 

 lower labial m contact with its fellow behind the symphysial; four 

 pairs of ohm-shields, anterior slightly longer than broad. Scales 

 in 15 rows^vertebrals strongly enlarged, the largest twice as broad 

 as long. VentralslSo; anal entire ; subcaudals 94. Pale brown 

 ubove, with numerous blaokish-brown cross-bands, lighter in the 

 midd e, the anterior as if divided into two; head much spotted and 

 marbled with blackish ; lower parts whitish, spotted with blackish 

 Drown. 



Total length 310 millim. ; tail 80. 

 Isthmus of Tehuantepec. 



a. Hgr. (V. 185; C. 94). Tehuantepec. M. F. Sumichrast [0,]. 



8. Leptognathus leucomelas. (Plate XXIV. fig. 1.) 



Leptognathus leucomelas, Bouleng. Ann. Sf Mag. N. H. (6) xvii. 

 -LcsyDj p. J./, 



Body strongly compressed. Eye large. Kostral 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 prse- 

 ocular ; prefrontal entering the eye ; two postoculars ; temporals 

 1-1-2; 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 milKm. ; tail 130. 



Colombia. 



a. $ (V. 188; 0. 85). Near Buenaventura. Mr. W. F. H. Rosenberg 



[C.]. (Type). 



9. Leptognathus mikani. 



Dipaas mikanii, Sehkg. Phys. Serp. ii. p. 277 (1837). 



Aaholodon mikanii, Dum. ^ Bibr. vii. p. 1165 (1854). 



Leptognathus mikanii, Oilnth. Cat. p. 178 (1858) ; Cope, Proa. Ac. 

 Philai. 18fi8, pp. 108 & 135 ; Jan, Icon. G&n. 37, pi. vi. fig. 3 

 (1870) ; Giinth. Ann. 8; Mag. N. H. (4) ix. 1872, p. 49 ; Boulmg. 

 Ann. ^ Mag. N. H. (5) xviii. 1886, p. 436. 



oreas. Cope, I. 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. .Eostral broader than 

 * I am indebted to M. Bocourt for notes on the type specimen. 



