3. LEPTOGNATHUS, 449 
1. Leptognathus catesbyi, 
Coluber catesbyi, Sentzen, Meyer’s Zool. Arch. ii. 1796, p. 66. 
Dipsas catesbei, Bote, Isis, 1827, p. 560; Schleg. Phys. Serp. ii- 
p- 279, pl. xi. figs. 21-23 (1837); Tschudi, Faun. Per., Herp. 
p. 57 (1845). 
Stremmatognathus catesbyi, Dum. § Bibr. vii. x 522 (1854) ; 
Guichen. in Casteln. Anim. Nouv. Amér. Sud, ii. Rept. p. 47, pl. ix. 
. (1855). 
Leptognathus catesbyi, part., Giinth. Cat. p. 180 (1858). 
catesbyi, Cope, Proc. Ac. Philad. 1868, p. 107; Jan, Icon. Gén. 
37, pl. ii. fig. 2 (1870). 
—— pavoninus (non D. § B.), Jan, 1. ¢, pl. iv. fig. 1. 
Body slender, strongly compressed. Eye large. Rostral much 
broader than deep, scarcely visible from above; internasals one 
half to two thirds as long as the prefrontals ; 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) przoculars, sometimes fused with the 
lower preocular ; two postoculars (rarely three, or fused into one) ; 
temporals 142, rarely 2+2; eight (rarely nine) upper labials, 
fourth and fifth, fifth and sixth, or fourth, fifth, and sixth entering 
the eye; first lower labial usually in contact with its fellow behind 
the symphysial; three pairs of chin-shields, the anterior longer 
than broad 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 millim. ; tail 200. 
Tropical South America. 
a-c. 3 (V.179; C.94) & hgr. Demerara Falls, 
(V. 179, 175; C. 87, 94). 
d-e. 3 (V.173; C.93) & 2 Surinam. Lidth de Jeude 
(V. 175; C. 83). Collection, 
f. Hgr. (V. 181; C. 98). Para. 
g. 2 (V. 183; C. 96). Para. re E. A. Géoldi 
P.}. 
h-t. g (V.190; C.?) & Q Pebas, Peru. Mr. tanawell [C.]. 
(V. 178; C. 97). 
k-l. 8 (V.180; C.87) & 9 Moyobamba, Peru. Mr. A. H. Roff 
(V. 162; C. 80). . er 
m-n. 3 (V. 185, 180; C. 95, Sarayacu, Peru, Mr. W. Davis [C.]; 
94). Messrs. Veitch 
: EPL 
VOL, III. . 26 
