1852.] 203 
San Francisco Mountain, New Mexico. One of the specimens in the collection of 
the Academy is from Mexico, the others are from Texas. My specimen is from 
New Mexico. When obtained it was feeding in company with 8. oregonus and 
various species of Parus, and it appeared very similar to the former and the 
common snow bird (S. hyemalis) in its habits. 
She 
The Committee on the following papers by Dr. Hallowell—namely, 
‘“Ona new Genus and tio new Species of African Serpents,” and 
‘On a new Genus and new Species of Reptiles, inhabiting North 
America,” reported in favor of publication in the Proceedings : 
On a new Genus and two rew species of African Serpents. 
By Epwarp Hattowe tt, M. D. 
Dinopuis Hallowell. 
Gen. Char.—¥orm, that of a tree snake ; perforated fangs in the anterior part 
of the upper jaw, immovable; several of the anterior teeth of the lower jaw 
longer than the others; but two rows of teeth in the upper jaw, the exterior row 
not existing ; two rows in the lower jaw, quite short; no loral plate; 4 posterior,* 
3 anterior orbital plates ; tail long, subcaudal scales bifid. 
Dinopuis Hammondii. 
Sp. Char.—Head olive color above, superior labials bordered with black; 
body above and upon sides green; total length about six feet; thirteen rows 
of long and smooth scales. Abdom. scuta 217. Sub. caud. 116. 
Description.—The head is long, rounded and narrow in front, covered above 
with nine plates; the upper surface in front of the orbits is flattened ; between 
the orbits it is convex, and also, but to a less extent, upon the occiput; the ros- 
tral is large, heptagonal, much broader below than above, excavated inferiorly, 
rounded in front; the anterior frontal are much smaller than the posterior, and 
are more or less quadrilateral in shape; the posterior frontal are very large, 
irregularly quadrilateral; they are prolonged exteinally upon the sides of the 
head, passing downward between the posterior nasal and the two superior ant- 
ocular plates; the vertical plate is short, very broad anteriorly ; the supra- 
orbital are also short, projecting very slightly over the eye, narrow in front, 
broad behind; the occipital are very large and pentangular, much larger than 
broad; there are two nasal plates of nearly equal size, the anterior somewhat 
larger, with the nostrils between them; the external openings for the latter 
are quite large; there is no loral plate ; there are three antocular and four poste- 
rior-oculars; the superior ant-ocular is the largest of the three; it is prolonged 
superiorly, so as to form a part of the upper surfaee of the head, entering in be- 
tween the posterior frontal and the vertical and supra-orbital plates; the inferior 
ant-ocular is small and quadrilateral, the middle long and slender; there are eight 
plates upon the margin of the upper jaw ; of these the seventh is the largest, and 
is remarkable for its unusuai form; its superior margin is nearly straight, its pos- 
terior and inferior very much curved; the plate on the left side in the specimen 
examined differs considerably from that on the right, beinz more prolonged, and 
also truncated posteriorly; the fourth labial plate forms part of the inferior 
margin of the orbit, the remainder being completed by the inferior, anterior, and 
posterior oculars; there is a long, triangular, temporal plate occupying 
the space between the occipital and the seventh superior labial ; the eyes are 
of moderate size, slightly projecting ; there are but two rows of teeth in the 
upper jaw, one on each side, and two in the lower; in the front part of the 
«In one of the specimens there are but three posterior oculars. 
