184 COLTJBEID^. 



5. Urotheca Ibicmcta. / 



Coluber bicinctus, Hermann, Obs. Zool. p. 276 (1804). 



Elapa scbranckii, Wagl. in Spix, Serp. Bras. p. 1, pi. i. (1824). 



Xenodon bicinctus, Schleg. Phys. Serp. ii. p. 95 (1837). 



Liophis bicinctus, Bum. ^ Bihr. vii. p. 716 (1864) ; QiXnth. Cat. p. 43 



(1858). 

 Leiosophis bicinctus, Jan, Arch. Zool. Anat. Fhys. ii. 1863, p. 321. 



Eye rather small ; snout short, rounded. Eostral much broader 

 than deep, just visible from above ; internasals as long as or shorter 

 than the prsefronf als ; frontal as long as broad or a little longer, 

 as long as or shorter than its distance from the end of the 

 snout, shorter than the parietals ; loreal nearly as long as deep or 

 longer than deep ; six scales surround the eye in addition to the 

 supraocular, the labials being excluded from the eye ; temporals 

 2 + 2 or 3 + 3; eight or nine upper labials; chin-shields short. 

 Scales in 19 or 21 rovrs. Ventrals 168-192; anal entire; sub- 

 caudals 69-94. Eeddish brown above, with black annuli arranged 

 in pairs, each pair bordered with yellow in front and behind ; a 

 black band behind the eye, confluent with another across the occiput 

 and descending to the gular region ; belly yellow, spotted with 

 black ; tail with complete annuli. 



Total length 1950 millim. ; tail 650. 



Guianas, Brazil. i 



a. (J (Sc. 18; v. 171 ; C. 90). British Guiana. Demerara Museum. 



b. 2 (Sc. 21 ; V. 176 ; C. 72). S. America. 



c. Yg. (Sc. 19 ; V. 169 ; C. 87j. S. America. Zool. Soc. 



83. TKIMETOPON. 



Trimetopon, Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 177. 



Maxillary short, with 12 teeth, which gradually increase in length 

 to the last ; mandibular teeth subequal. Head scarcely distinct from 

 neck ; eye small, with round pupil ; a single prsefrontal. Body elon- 

 gate, cylindrical ; scales smooth, with very indistinct apical pits, in 

 15 rows ; ventrals rounded. Tail moderate ; subcaudals in two rows. 



Central America. 



1. Trimetopon gracile. 



Ablabes gracilis, Oiinth. Ann. 8f Mag. N. S. (4) ix. 1872, p. 18, pi. iii. 



%.D. 

 Trimetopon gracile, Cope, Proc. Amer. Philos. Soc. xxii. 1885, p. 177. 



Snout short, rounded. Hostral more than twice as broad as deep, 

 scarcely visible from above ; internasals small, much broader than 

 deep ; prefrontal nearly twice as broad as deep ; frontal once and 

 one third to once and a half as long as deep, a little longer than its 

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

 loreal small, longer than deep ; one prse- and one postocular ; 

 temporals 1 + 1 ; seven or eight upper labials, third and fourth or 

 fourth and fifth entering the eye ; four or five lower labials in 



