422 Mr. G. A. Boulenger oi 



A single specimen from El Topo, Rio Pastaza, E. Ecuador, 

 4200 feet, from the collection of Mr. M. G. Palmer. 



LeptognatJius palmeri. 



Body slender, strongly compressed. Eye large. Rostral 

 broader than deep, just visible from above ; internasals nearly 

 half as long as the praefrontals ; frontal slightly broader than 

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

 than the parietals ; nasal divided ; loreal a little deeper than 

 long, bordering tiie eye, with a pra^ocular above it ; two post- 

 oculars ; temporals 2 + 3; nine upper labials, fourth, fifth, 

 and sixth entering the eye; first lower labial in contact with 

 its fellow behind the symphysial ; three pairs of chin-shields, 

 ajiterior longer than broad. Scales in 15 rows, vertebrals 

 enlarged but longer than broad. Ventrals 187 ; anal entire; 

 subcaudals 120. Reddish brown, with broad blackish-brown 

 annuli, edged with yellowish, on the anterior part of the 

 body ; further down these annuli are gradually replaced by 

 pairs of large alternating spots which approximate on the 

 vertebral line but are widely separated on the belly ; head 

 blackish brown, with yellowish-white bars on the labial 

 shields and a few light dots on the loreal and temporal 

 regions. 



Total length 950 ; tail 310 mm. 



A single male specimen from El Topo, Rio Pastaza, 

 E. Ecuador, 4200 feet, from the collection of Mr. M. G. 

 Palmer. 



Allied to L. aJternans, Fisch. Distinguished by the shorter 

 frontal, the divided nasal, and the absence of a lower pr^- 

 ocular. Distinguished from L. holiviana, Werner, from 

 Bolivia, by the shorter frontal and the presence of two super- 

 posed anterior temporals. 



Leptognathus polylepis. 



Body slender, rather strongly compressed. Eye large. 

 Rostral broader than deep, scarcely visible from above ; 

 internasals nearly half as long as the prefrontals ; frontal as 

 long as broad, a little longer than its distance from the end 

 of the snout, much shorter than the parietals; nasal divided ; 

 loreal as long as deep, bordeiing the eye, with a praeocular 

 above it; two postoculars ; temporals 2 + 3; nine upper 

 labials, fourth, fifth, and sixth entering the eye ; first lower 

 labial in contact with its fellow behind the symphysial ; 

 three pairs of chin-shields, anterior a little longer than broad. 



