

l"'.l. PETALOGNATHUS. 293 



vertically elliptic pupil ; no prjeocular, loroal and praefrontal 

 filtering tin- eve. I Muly c-longate, compressed; scales smooth, 

 without pits, in 1"> rows, the middle row formed of enlarged 

 sealrs ; M-ntrals rounded. Tail long ; subcaudals in two rows. 

 Tropical America. 



1. Petalognathns nebulatus. 



Coluber nebulatus, Linn. Mus. Ad. Frid. p. 32, pi. xxiv. fig. 1 (1754), 



and S. N. i. p. 883 (176G) ; Daud. Rept. vi. p. 413 (1803). 



- sibon, Linn. S. N. i. p. 383 : Daud. t. c. p. 436. 

 ( ' -i-astes nebulatus, Laur. Syn. Kept. p. 83 (1768). 

 Dipsas nebulatus, Boie, /', 1827, p. 600; Schleg. Phys. Serp. ii. 



p. 27/5. pi. xi. figs. 14 & 15 (1837). 



I Vtiilognathus nebulatus, Dum. ST Bibr. vii. p. 464 (1854). 

 Leptognathus nebulatus, Giintk. Cat. p. 177 (1858) ; Cope, Proc. Ac. 



Philad. 1868, p. 108 ; Jan, Icon. Gen. 37, pi. v. fig. 8 (1870) ; 



Garm. N. Am. Rept. p. 13 (1883). 



Snout short, as long as or a little longer than the diameter of the 

 eye. Itostral as broad as deep or a little broader than deep, not 

 or scarcely visible from above ; internasals about half the length of 

 the praefrontals ; 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 17 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 millira. ; tail 210. 



Central and South America, from Mexico to Northern Brazil and 

 Ecuador ; Trinidad and Tobago. 



a-b. rf (V. 177, 176 ; C. Mexico. Mr. Hugo Finck [0.1. 



85,83). 



c. ^ (V. 174 ; C. 81). City of Mexico. Mr. Doorman [CJ. 



d-g. S "(V. 178, 176 ; C. Teapa, Tabasco. F. D. Godinan, Esq. 



82,92) & $ (V. 174, [P.]. 



17r> : C.81,77). 

 A. $ (V. 170; C. 90). N. of Coban, Guate- F. C. Sarg, Esq. [C.]. 



mala. 



i. $ (V.178; C.84). Hacienda Rosa de Dr. E. Rothschuh [C.]. 



Jericho, Nicaragua, 

 8250ft. 



k. rf (V. 194 ; C. 93). \Y . Ecuador. Mr. Fraser [C.]. 



l-m. $ (V. 175 ; C. 86) & Venezuela. Mr. Dyson [C.t 



yg.(V.179;C.98). 

 n. $ (V. 183 ; C. 91). Tobago. A. Ludlam, Esq. [P.]. 



