456 AMBlYCBPHALIDiB. 



12. Leptognathus turgida. 



CochliophagTia insequifasciatus (non D. 8f B.), Cope, Proe. Ac. 



Philad. 1862, p. 347. 

 Leptognathus turgida, Cope, Proe. Ac. Philad. 1868, pp. 108 and 



136. 

 mikanii (reora Schleg.), Boettg. Zeitschr. ges. Naturw. Iviii. 



1885, p. 238; Peracca, Boll. Mm. Torn. x. 1895, no. 195, p. 21. 



Body feebly compressed. Eye moderate. Eostral broader than 

 deep, scarcely visible from above ; internasals two thirds the length 

 of the prsefrontals ; frontal slightly broader than long, as long as its 

 distance from the end of the snout, much shorter than the parietals ; 

 nasal divided; loreal once and a half as long as deep, bordering 

 the eye ; no prseocular, prsefrontal entering the eye ; two post- 

 oculars ; temporals 1+2; seven upper labials, third and fourth 

 entering the eye ; first lower labial in contact with its fellow behind 

 the symphysial ; four pairs of chin-shields, anterior a little longer 

 than broad. Scales in 15 rows, vertebrals not enlarged. Ventrals 

 149-159 ; anal entire ; subcaudals 41-51. Pale brown above, 

 with a dorsal series of large transverse black, white-edged spots 

 not extending down the sides, and a lateral series of smaller spots — 

 the first spot forming a collar, descending to the sides of the neck; 

 a cross-shaped black marking on the head, with two large spots on 

 each side of it ; lower parts white, with an irregular series of small 

 black spots on each side. 



Total length 255 millim. ; tail 43. 



Paraguay, Matto Grosso. 

 v«- 



a. Hgr. (V. 159 ; 0. 44). Asuncion, Paraguay. Dr. J. BoMs [0.]. 



b. Tg. (V. 162 ; 0. 45). Oorumba, Matto Grosso. S. Moore, Esq. [P.], 



13. Leptognathus alternans. 



Leptognathus alternans, Fischer, Jahrb. Hamh. Wiss. Anst. ii, 1885, 

 p. 105, pL iv. fig. 8. 



Body slender, strongly compressed. Eye large. Eostral broader 

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

 the prsefrontals ; frontal as long as broad, as long as its distance 

 from the end of the snout, much shorter than the parietals ; nasal 

 entire ; loreal deeper than long, separated from the eye by two 

 prseoculars; two postoculars ; temporals 1 + 2; nine upper labials, 

 fourth, fifth, and sixth entering the eye ; first lower labial in con- 

 tact with its fellow behind the symphysial ; three pairs of chin- 

 shields, anterior a little longer than broad. Scales in 15 i-ows, 

 vertebrals feebly enlarged. Ventrals 197 ; anal entire ; subcaudals 

 110. Pale reddish brown above, with two series of elongate oval, 

 dark brown, light-edged spots, opposed to each other or alternating, 

 narrowly separated on the vertebral line, and descending to the 

 sides of the ventrals ; neck dark brown above ; head pale brown, 

 with a large, oval, dark brown, white-edged spot on each parietal 



