18 Mr. G. A. Boulenger on neto 



deep, just visible from above ; internasals not half as long as 

 the prfefrontals ; frontal hexagonal, obtuse-angled in front, 

 acute-angled behind, twice as long as broad, much longer 

 than its distance from the end of the snout, shorter than the 

 parietals ; nostril between two nasals, the posterior widely 

 separated from the prseocular ; two postoculars ; temporals 

 l + l ; seven upper labials, second in contact with the pre- 

 frontal, third and fourth entering the eye ; first lower labial 

 in contact with its fellow behind the symphysial ,• four lower 

 labials in contact with the anterior chin-shields, which are 

 longer than the posterior. Scales in 15 rows. Ventrals 158; 

 anal divided ; subcaudals 85. Pale brown above, with five 

 dark brown longitudinal lines ; head and nape black ; a 

 yellow band across the snout ; a yellow blotch on each side of 

 the head behind the eye ; a round yellow spot on each side of 

 the vertex, between the supraocular and the parietal, another 

 pair on the back of the head between the parietal and the 

 second temporal, and a yellow dot on each parietal near the 

 median suture ; the black of the nape bordered with yellow 

 behind ; a series of blackish dots along the outer row of scales ; 

 lower parts white. 



Total length 1800 millim., tail 803. 



A single male specimen from Cali. 



Allied to H. metanocephalui7i, L., but distinguished by the 

 longer frontal shield and the longer tail. 



Leptognathus leucomelas. 



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 pra30cular; prgefrontal 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. 



A single female specimen from Buenaventura. 



