446 AMBLYCEPHALID^. 



-two postoculars; temporals 2 + 3 or 3+4; seven or eight upper 

 labials ; last very long, none entering the eye ; first lower labial in 

 ■contact with its fellow behind the symphysial ; three pairs of large 

 chin-shields, broader than long. Scales in 1 5 rows, three dorsal rows 

 slightly enlarged and more or less distinctly keeled, the keels 

 sometimes hardly distinguishable. Ventrals 161-183 ; anal entire; 

 subcaudals 57-80. Yellowish or reddish brown above, with 

 blackish transverse spots or more or less regular cross-bars inter- 

 rupted on the spine ; a black line on each side of the head behind 

 the eye, confluent with an X-shaped black blotch on the nape ; an 

 oblique black line from below the eye to the anterior border of the 

 last upper labials; yellow beneath, dotted or striolated with 

 "blackish, or with a median blackish line. 



Total length 500 millim. ; tail 115. 



Cochinchina, Burma, Java. 



a. cJ (V. 163 ; C. 65). Java. Leyden Museum. 



b. S (V. 176; 0.76). Java. J. 0. Bowring, Esq. 



i', d. S (V. 165, 178 ; Java. 

 0. 69, 80). 



e. $ (V. 162; 0. 57). WiUis Mts.,Kediri, Baron v. Huegel [0.]. 



Java. 



f. (J (V. 166 : 0. 71). Lao Mountains. M. Mouhot [0.]. 



a. c? skeleton. Batavia. R. Kirkpatrick, Esq. 



[P.]. 



3. LEPTOGNATHUS. 



Dipsas, part., Wagler, Syst. Amph. p. 180 (1830) ; Schleg. Phys. 



Serp. ii. p. 257 (1837) ; Cope, Proc. Ac. PUlad. 1860, p. 265. 

 Leptognathus, Dum. Sf Bibr. MSm. Ac. Sc. xxiii. 1853, p. 467, and 



Erp. Oen. vii. p. 473 (1854). 

 Cochliophagus, Bum. Sf Bibr. II. ec. pp. 467, 478. 

 Stremmatognathus, Dum. fy Bibr. II. cc. pp. 468, 520. 

 Anholodon, Dum. ^ Bibr. Erp. Gen. vii. p. 1165. 

 Leptognathus, part., Oiinth. Cat. Col. 8n. p. 177 (1858) ; Jan,Blenco 



sist. Ofid. p. 100 (1863) ; Cope, Proc. Ac. PMad. 1868, p. 107. 

 Dipsadomorus, part., Jan, I. c. p. 99. 

 Mesopeltis, Cope, Proc. Ac. Philad. 1866, p. 318. 

 Asthenognathus, Bocourt, Bull. Soc. Philom. (7) viii. 1884, p. 141. 

 Neopareas, Oiinth. Biol. C.-Am., Eept. p. 178 (1895). 



Maxillary bone with the toothed border more or less turned 

 inwards ; teeth 11 to 18, equal or middle longest ; mandibular 

 teeth, anterior longest, gradually decreasing in length. Head 

 distinct from neck; eye moderate or large, with vertical pupil; 

 nasal entire or divided. Body more jot less compressed ; scales 

 smooth, without pits, more or less oblique, in 13 or 15 rows, 

 vertebral row enlarged or not ; ventrals rounded. Tail moderate 

 or long ; subcaudals in two rows. 



Central and South America. 



