109. PETALOGNATHUS. 293 
vertically elliptic pupil; no preocular, loreal and _ prefrontal 
entering the eye. Body elongate, compressed; scales smooth, 
without pits, in 15 rows, the middle row formed of enlarged 
scales; ventrals rounded. ‘Tail long ; subcaudals in two rows. 
Tropical America. 
1. Petalognathus nebulatus. 
Coluber nebulatus, Linn. Mus. Ad. Frid. p. 82, pl. xxiv. fig. 1 (1754), 
and S, N.i. p. 885 (1766) ; Daud. Rept. vi. p. 418 (1808). 
sibon, Linn. S. N.i. p. 883; Daud. t. c. p. 485, 
Cerastes nebulatus, Laur, Syn. Rept. p. 83 (1768). 
Dipsas nebulatus, Bote, Isis, 1827, p. 560; Schley. Phys. Serp. ii. 
‘p. 275, pl. xi. fis, 14& 15 (1837). 
Petaloenathus nebulatus, Dum. § Bibr. vii. p. 464 (1854). 
Leptognathus nebulatus, Giinth. Cat. p. 177 (1858) ; Cope, Proc. Ac. 
Philad. 1868, p. 108; Jan, Icon. Gén. 37, pl. v. fig. 3 (1870) ; 
Garm. N. Am. Rept. p: 13 (1883). 
Snout short, = long as or a little longer oe the diameter of the 
eye. Rostral as broad as deep or a little broader than deep, not 
or scarcely visible from above; internasals about half the length of 
the prafrontals ; frontal once and one fourth to once and one third 
as long as broad, as long as its distance from the end of the snout, 
shorter than the parietals ; loreal a little longer than deep; two 
(rarely three) postoculars ; temporals 1+2; seven (rarely eight) 
upper labials, fourth and fifth (or fourth, fifth, and sixth) entering 
the eye; five (rarely six) lower labials in contact with the anterior 
chin-shields, which are longer than the posterior. Scales smooth, 
in 1% rows. Ventrals- 170-197; anal entire; subcaudals 73-102. 
Grey or grey-brown above, with blackish spots, or mottled black 
and white, with more or less regular cross bars which may have a 
light edge; ‘belly yellowish, with black dots and more or less 
regular black cross bars or large alternating spots. 
Total length 790 millim. ; tail 210. 
Central ine South Arerieal from Mexico to Northern Brazil and 
Ecuador; Trinidad and Tobago. 
4-0.-5, (Volts, 1i65°C. Mexico. Mr. Hugo Finck [C.]. 
85, 85). 
a OoCVe 174; C. 81). City of Mexico. Mr. Doorman [C.]. 
d-g. 3 (V. 178, 176; C. Teapa, Tabasco. F, D. Godman, Esq. 
82,92) & 9 (V. 174, el 
175; C. 81,77). 
A. 2 (V. 170; C. 90). N. of Coban, Guate- F. C. Sarg, Esq. [C.]. 
i. Q (V.178; C.84). 
mala. 
Hacienda Rosa de 
Jericho, Nicaragua, 
3250 ft. 
Dr. E. Rothschuh [C.]. 
k. d (V. 194; C. 93). W. Ecuador. My. Fraser et 
I-m. Q (V. 175; C.86) & Venezuela. Mr. Dyson [C.]. 
youGw. Lio); (cl 98). 
n. 9 (V. 183; C. 91). Tobago. A. Ludlam, Esq. [P.]. 
