3. LEPTOCtNAIHCS. 



449 



1. Leptognathus cates'byi. 



Coluber catesbyi, Sentzen, Meyer's Zool. Arch. ii. 1796, p. 68. 

 Dipsas oatesbssi, Boie, Isis, 1827, p. 560; Sohkg. Phya. Serp. ii, 



p. 279, pi. xi. figs. 21-23 (1837) ; Tsahudi, Faun. Per., Serp. 



p. 57 (1845). 

 Stremmatognathus catesbyi, Dum. 8^ Bibr. vii. p. 522 (1854) ; 



Guicken. in Casteln. Anim. Nouv. Am&r. Sud, ii. Sept. p. 47, pi. ix. 



(1855). 

 Leptognathus catesbyi, part., Oiinth. Cat. p. 180 (1858). 

 catesbyi, Cope, Proc. Ac. Philad. 1868, p. 107 ; Jan, loon. Oen. 



37, pi. ii. fig. 2 (1870). 

 pavoninus (mm D. ^ B.), Jan, I. c. pi. iv. fig. 1 . 



Body slender, strongly compressed. Eye large. Eostral much 

 broader than deep, scarcely visible from above ; internasals one 

 half to two thirds as long as the prsefrontals ; frontal as long as 

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

 the snout, shorter than the parietals ; nasal entire or semidivided ; 

 loreal as long as deep or deeper than long, usually separated from 

 the eye by two (rarely three) prseoculars, sometimes fused with the 

 lower praeooular ; two postooulars (rarely three, or fused into one) ; 

 temporals 1+2, rarely 2+2; eight (rarely nine) upper labials, 

 fourth and fifth, fifth and sixth, or fourth, fifth, and sixth entering^ 

 the eye ; fl.rst lower labial usually in contact with its fellow behind 

 the symphysial ; three pairs of chin-shields, the anterior longer 

 than liroad and rarely in contact with the symphysial. Scales in 

 13 rows, vertebrals very strongly enlarged, largest twice as broad 

 as long. Ventrals 162-190 ; anal entire ; subcaudals 82-108. 

 Yellowish or reddish brown to dark brown above, whitish beneath, 

 with large round or oval, white-edged dark brown or black spots 

 disposed in pairs or alternating and extending from the vertebral 

 line to the sides of the belly ; head and neck blackish brown, with 

 white or pale brownish cross-bars or annuli , the first forming a 

 collar ; belly more or less spotted or speckled with dark brown or 

 black. 



Total length 670 miUim. ; tail 200. 



Tropical South America. 



fl-e. cJ (V. 179 ; 0. 94) & hgr. Demerara Falls. 



(V. 179, 175 ; 0. 87, 94). 



d^e. d (V. 173 ; 0. 93) & ? Surinam. 



(V. 175; 0.83). 



/. Hgr. (V. 181 ; C. 93). Para. 



ff. $ (V. 183; 0. 96). Para. 



h-i. cJ (V. 190 ; 0. ?) & ? 



(V. 178; 0.97). 

 Ji^l. J (V. 180 ; 0. 87) & 2 



(V. 162 ; 0. 80). 

 jra-n. t? (V. 185, 180; 0.95, 



94). 



VOL. in. 



Pebas, Peru. 

 Moyobamba, Peru. 

 Sarayacu, Peru. 



Lidth de Jeude 

 CoUeotion. 



Dr. E. A. Goldi 



[P.], 

 Mr. HauxweU [0.]. 



Mr. A. H. Roff 



Mr. W.Davis [0.]; 

 Messrs. Veitch 

 [P]. 

 2a 



