3. LEPTOGNATHUS. 451 
3. Leptognathus variegata. 
Leptognathus variegatus, Dum. § Bibr. vii. p. 477 (1854); Giinth. 
at. p. 179 (1858); Cope, Proc. Ac. Philad. 1868, p. 107. 
Dipsadomorus variegatus, Jan, Elenco, p. 100 (1863), and Icon. 
Gén. 87, pl. iii. fig. 1 (1872). 
Body strongly compressed. Eye large. Rostral broader than 
deep, scarcely visible from above; internasals about half as long as 
the preefrontals ; frontal nearly as long as broad, as long as its 
distance from the end of the snout, shorter than the parietals ; 
nasal semidivided ; loreal deeper than long, bordering the eye; no 
preocular ; prefrontal entering the eye ; two or three postoculars ; 
temporals 2+3 ; nine or ten upper labials, third, fourth, and fifth, 
or third, fourth, fifth, and sixth entering the eye; first two pairs of 
lower labials forming a suture behind the symphysial ; two pairs of 
chin-shields, broader than long. Scales in 15 rows, vertebrals 
moderately enlarged. Ventrals 180-192; anal entire; subcaudals 
88-91. Brown above, with narrow dark brown cross-bands formed 
of confluent spots ; some dark brown spots on the back of the head ; 
labials dark-edged; lower parts whitish, dotted or spotted with 
brown and with a large dark brown spot on each side as a prolon- 
gation of the dorsal cross-bands. 
Total length 640 millim. ; tail 170. 
Guianas. 
a,b. g (V.180; 0.91) &hgr. —_ British Guiana. 
_ ’ (V. 186; C. 90). 
4, Leptognathus albifrons. 
Dipsadomorus albifrons, Sauvage, Bull. Soc, Philom. (7) viii. 1884, 
p- 146. 
Body slender, strongly compressed. Eye large. Rostral broader 
than deep, scarcely visible from above; internasals half as long as 
the prefrontals ; frontal slightly longer than broad, longer than its 
distance from the end of the snout, shorter than the parietals ; 
nasal divided ; loreal as long as deep, bordering the eye; a small 
preocular above the loreal; two postoculars; temporals 1+2 or 
242; seven upper labials, fourth and fifth or third, fourth, and 
fifth entering the eye; two or three pairs of lower labials in contact 
with each other behind the symphysial ; three pairs of chin-shields, 
anterior a little broader than long. Scales in 15 rows, vertebrals 
rather feebly enlarged. Ventrals 168; anal entire; subcaudals 
85. Pale brownish above, with brown dark and light edged trans- 
verse spots or cross-bands, some of which are broken on the 
vertebral line and alternate; a brown spot on each side between 
every two bands; head whitish, with two elongate brown spots on 
the parietal shields ; belly whitish, speckled with brown. 
Total length 450 millim.; tail 115. 
Brazil. 
a. 3 (V. 168; C, 85), Blumenau, Santa Catharina. ‘5 
24 
