' 109. PETArOGNATHTJS. 293 



vertically elliptic pupil ; no prseociilar, loreal and prsefrontal 

 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. 32, pi. xxiv. fig. 1 (1754), 



and S. N. i. p. 383 (1766) ; Baud. Rept. V\. p. 413 (1803). 



sibon, Linn. 8. N. i. p. 383 ; Baud. t. c. p. 435. 



Cerastes nebulatus, Laur. Syn. Rept. p. 83 (1768). 



Dipsas nebulatus, Boie, Isis, 1827, p. 660; Schleg. Phys. Serp. ii. 



p. 275, pi. xi. figs. 14 & 15 (1837). 

 Petalognathus nebulatus, Dwm. ^ Bibr. Tii. p. 464 (1854). 

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



Philad. 1868, p. 108 ; Jan, Icon. G4ii. 37, pi. v. fig. 3 (1870) ; 



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



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

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

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

 the prcefrontals ; 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 mUlim. ; tail 210. 



Central and South America, from Mexico to Northern Brazil and 

 Ecuador ; Trinidad and Tobago. 



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



85, 83). 

 c. 2 (V. 174; C. 81). City of Mexico. Mr. Doorman [C.]. 



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



82, 92) & 2 (V. 174, [P.]. 



175; 0.81,77). 

 h. 2 (V. 170; C. 90). N.of Coban,Guate- F. C. Sarg, Esq. [C.]. 



mala. 



i. 2 (V. 178; C.84). Hacienda Rosa de Dr. E. Eothschuh [C.]. 



Jericho, Nicaragua, 



8250 ft. 



k (3 (V. 194 ; C. 93). W. Ecuador. Mr. Eraser [CI. 



l-m. 2 (V.175; C. 86) & Venezuela. Mr. Dyson [CJ. 



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

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



