282 ANGUIDX. 
width of the frontal, usually separated from the latter by a pair of 
prefrontals ; interparietal narrower than the parietals, as broad as 
or narrower than the occipital ; two shields on a line from the nasal 
to the azygos prefrontal; four supraoculars and five supraciliaries. 
Ear-opening distinct, horizontal, considerably larger than the nostril. 
Dorsal plates in fourteen longitudinal and about one hundred and 
twenty transverse series ; the median dorsal plates obtusely keeled, 
the laterals as well as the ventrals smooth; latter in ten longitu- 
dinal series. No rudiments of limbs externally. Tail about twice 
as long as the body; upper caudal plates obtusely keeled, lower 
smooth. Green above, marked with black and yellow, or brownish 
with lateral dark brown longitudinal bands; lower surfaces yellow. 
From snout to vent 28 centim.; tail 51. 
Eastern North America; from Mexico (Jalapa) northwards to 
North Carolina and the southern parts of Llinois. 
a. Ad. N. America. Dr. R. Harlan [P.]. 
b. Ad. N. America. Lord Ampthill [P.]. 
ce. Ad. N. America. 
3. Ophisaurus attenuatus. 
Opheosaurus ventralis attenuatus (Baird), Cope, Bull. U.S. Nat. Mus. 
no. 17, 1880, p. 18. 
—— ventralis, Shufeldt, Proc. U. 8. Nat. Dfus. iv. 1882, p. 892. 
Differs from O. ventralis in the following points :—A single longi- 
tudinal row of small teeth on the posterior part of the palatines and 
on the pterygoids, where the row becomes double. Head narrower 
and more depressed. ar-opening minute, not larger than the 
nostril. Dorsal shields in fourteen longitudinal and one hundred 
transverse series. Pale yellowish-olive, back with three longitudinal 
dark brown bands, the median of which disappears on the tail; 
sides of head and of anterior part of body sprinkled yellowish 
and dark brown. 
From snout to vent 20 centim.; tail 51 millim. 
The geographical range of this form remains to ascertain. Cope 
calls it a Western form, 7. ¢. apparently restricted to Texas and New 
Mexico. Whether the form occurring in North Mexico is the pre- 
sent or the preceding is not known. 
a, Ad. N. America. E. Doubleday, Esq. [P.]. 
Var. sulcatus, Under this name, Cope records a form from 
Texas, which he provisionally regards as a variety of the present. 
The carinee are elevated on the ten median dorsal rows, so as to 
leave sulci between them; on the posterior part of the body the 
keels extend to the lateral rows, and on the tail even to the inferior 
surface. These notes are taken from a halfgrown specimen. 
