58 COLUBRID. 
2. Lycognathus rhombeatus. 
Oxyrhopus rhombeatus, Peters, Mon. Berl. Ac. 1863, p. 288. 
Rostral twice as broad as deep, just visible from above; inter- 
nasals much shorter than the preefrontals; frontal once and a half 
as long as broad, longer than its distance from the end of the snout, 
as long as the parietals; loreal once and two thirds to twice as long 
as deep; one preocular, extending to the upper surface of the head 
but not reaching the frontal; two postoculars; temporals 243; 
eight upper labials, fourth and fifth or third, fourth, and fifth 
entering the eye; four lower labials in contact with the anterior 
chin-shields, which are as long as the posterior. Scales in 19 rows. 
Ventrals 223-230; anal entire; subcaudals 110-115. White, 
with large black blotches disposed in partly confluent pairs 
alternating on each side of the vertebral line on the greater part of 
the body; two black cross-bands on the neck and complete annuli 
on the posterior part of the body; head dotted with black; lower 
parts white, some of the black blotches extending on the ventrals, 
Total length 820 millim. ; tail 220. 
Brazil. 
a. & (V. 220; 0,115). Bahia. Dr. O. Wucherer [C.]. 
147. TRYPANURGOS. 
Boiga, part., Fitzing. N. Class. Rept. p. 29 (1826). 
Dipsas, part., Schleg. Phys. Serp. il. p. 257 (1887). 
Trypanurgos, Fitzing. in Tschudi, Faun. Per., Herp. p. 55 (1845). 
Lycognathus, part., Dum. § Bibr. Erp. Gén. vii. p. 916 (1854). 
Eudipsas, part., Giinth. Cat. Col. Sn. p. 168 (1858), 
Esch, part., Jan, Elenco sist. Ofid. p. 92 (1863). 
Maxillary teeth 13 to 15, anterior much longer than the posterior, 
which gradually decrease in size, followed, after an interspace, by a 
pair of enlarged, grooved teeth situated below the posterior border 
of the eye; anterior mandibular teeth strongly enlarged. Head 
distinct from neck ; eye large, with vertically elliptic pupil. Body 
compressed ; scales smooth, slightly oblique, with apical pits, in 19 
rows, the vertebral row enlarged; ventrals obtusely angulate laterally. 
Tail long; subcaudals in two rows. 
Tropical South America. 
1. Trypanurgos compressus. 
Coluber compressus, Daud. Rept. vi. a 247 (18038). 
— leucocephalus, Mikan, Delect. Faun. Flor. Bras. pl. —. fig. 2 
1820). 
Boga leucocephala, Fitzing. N. Class. Rept. p. 60 (1826). 
Dipsas compressus, Boie, Isis, 1827, p. 560. 
leucocephala, Schleg. Phys. Serp. ii. p 288 (1837). 
Dipsadomorphus compressus, Z'schudi, Faun. Per., Herp. p. 55 
(1845). eae 
Lycognathus leucocephalus, Dum. § Bibr. vii. p. 924 (1854). 
