292 COLUBRID. 
distance from the end of the snout, shorter than the parietals; 
loreal much longer than deep; two postoculars ; temporals 1+ 2; 
seven upper labials, third and fourth entering the eye; four lower 
labials in contact with the anterior chin-shields, which are longer 
than the posterior. Scales in 19 rows, more or less distinctly 
keeled in the ischiadic region. Ventrals 168-206; anal divided ;; 
subcaudals 34-49. Black above; sides and belly red, with black 
cross bars or alternating spots. 
Total length 1020 millim.; tail 150. 
Mississippi Valley and eastwards. 
a,b,c. d (V. 170; C. 46) New Orleans. M. Sallé [C.]. 
& O (V. 189, 191; C. 
36, 36). 
d. 2 (V.199; C.37), skin N. America. 
& skeleton. 
e. Yg. (V. 172; CO. 34). N. America. Mrs. Drummond [P.]. (Type 
of F. drummondi.) 
Perey ew. LOSs °C; ie). N. America. Sir R. Murchison [P.}. 
109. PETALOGNATHUS. 
Dipsas, part., Schleg. Phys. Serp. ii. p. 257 (1837). 
Petalognathus,, Dum. § Bibr. Mém, Ac. Se. xxiii. 1853, p. 466, and 
Erp. Gén. vii. p. 463 (1854). 
Leptognathus, part, Giinth. Cat. Col. Sn. p. 177 (1858); Jan, 
Elenco sist, Ofid. p. 100 (1863); Cope, Proce. Ac. Philad. 1868, 
p. 107. . 
fm) 
St 
S 
~ 
sy 
~ 
~ 
Sc ee Ess a 
Skull of Petalognathus nebulatus. 
Maxillary short, with 15 or 16 teeth, which gradually decrease 
in size; posterior mandibular teeth gradually decreasing in size. 
Head short and thick, very distinct from neck; eye large, with 
