3. LEPTOaiTATHXrS. 451 



I 



3. Lepto^athus variegata. 



Leptognathus variegatus, Ditm. 8f Bibr. vii. p. 477 (1864) ; Giinth. 



Cat p. 179 (1858) ; Cope, Proc. Ac. Philad. 1868, p. 107. 

 Dipsadomorus variegatus, Jan, Elenco, p. 100 (1863), and loon. 



G&n. 37, pi. iii. fig. 1 (1872). 



Body strongly compressed. Eye large. Eostral broader than 

 deep, scarcely visible from above ; internasals about half as long as 

 the prsefrontals ; 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 

 prseocular ; proefrontal entering the eye-; two or three postooulars ; 

 temporals 2+3 j 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 

 ohin-shields, broader than long. Scales in 15 rows, vertebrals 

 moderately enlarged. Ventrals 180-192 ; anal entire ; subeaudals 

 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 miUim. ; tail 170. 



Guianas. 



a, b. 3 (V. 180 ; C. 91) & hgr. British Guiana. 



(V. 186 ; 0. 90). 



4. Leptognathus albifrons. 



Dipsadomorus albifrons, Sauvage, Bull. Soc. Philom. (7) viii. 1884, 

 p. 145. 



Body slender, strongly compressed. Eye large. Eostral broader 

 than deep, scarcely visible from above ; internasals half as long as 

 the prffifrontals ; 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 

 prseocular above the loreal; two postoculars ; temporals l-|-2 or 

 2+2; 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; subeaudals 

 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 miUim. ; tail 115. 



Brazil. 



a. cJ (V. 168 ; 0. 85). Blumenau, Santa Catharina. 



2e2 



