126 ; [ Auaust, 
which is directed backwards. The tail underneath is provided with black patches 
similar to those in H. tezana. 
Locality.—Found with the preceding species. 
Honsrooxia PRopinqua, B. and G.—This species, very closely allied to H. 
maculata, is most readily distinguished by a more slender form of body and a 
more elongated tail. Another character is found in the possession of a more 
depressed and protruding snout. On the sides of the abdomen there are some- 
times two, but generally three, black patches. whilst in H. maculata these con- 
ditions are reversed. 
Localities.— Between Indianola and San Antonio (Texas.) We possess one 
individual of the same species, collected by R. H. Kern, Esq., in a more south- 
westerly locality. | 
Horprooxia MacuLata, G.—Specimens of this species were obtained on the 
boundary line between San Antonio (Texas) and E] Paso del Norte, thus extend- 
ing greatly its geographical range. 
Crotaruytus Gameewu, B. and G.—Of the size, shape and general appear- 
ance of C. Wislizenii, from which however it can be readily distinguished by 
the larger scales both on the back and belly. The head is likewise more ovoidal; 
at any rate the plates which cover its surface are larger, especially on the occipi- 
tal region. The scales on the sides of the head are larger than in C. Wislizenit, 
especially those of the temporal region. The general distribution of color is 
the same as in C. Wislizeniz; the only difference consists in the absence of the 
small yellowish white dots spread all over the body of the latter'species. The 
transverse yeilowish markings appear also to be more conspicuous. 
Locality.—Not precisely known;. collected by the late Dr. Wm. Gambel 
during his last visit to California. Specimens also in the Academy of Natural 
Sciences. 
CROTAPHYTUS DORSALIS, B. and G.—A small and very characteristic species. 
The snout is short, truncated or rather rounded, giving to the head a much greater 
resemblance to that. of C. collarts than to that of either C. Wislizeniz or C. 
Gambelii. The scales are proportionally larger than in any of the known species 
of the genus. Along the dorsal line, a row of still larger and carinated scales, — 
constitutes another very distinctive mark between this species and the others, its 
congeners. The tail seems rather compressed and is one anda half tirnes the length 
of the body. The ground color above is bluish brown with crowded yellowish- 
white subcircular spots. The tail is alternately semi-annulated with bluish- 
brown and yellowish-white. The Jower part of the body is unicolor, except 
under the head, where there are several narrow and oblique bluish streaks. 
Locality.—Desert of Colorado, California. Collected by Dr. John L. LeConte. 
This species, according to the notes of Dr. LeConte, in running, carries its 
body very. high above the ground, with the tail frequently elevated over the back, 
somewhat like a squirrel. It runs with very great swiftness, over the sand, 
making for its hole whenever pursued. 
Ura ornata, B. and G.—This species may be distinguished from U. Stanshu- 
riana, of which it has the general appearance, by a dorsal space covered with 
five or six rows of scales larger than those on the sides of the body. Along the 
middle of the sides there exists one row of small scutelle imitating the lateral 
line in fishes. The ground color is reddish-brown with transversely elongatea 
black patches all along the upper part of the body and tail. The belly is uni- 
color in the female, whilst it is blue in the male. 
Localities.—On the Rio San Pedro (Texas) and province of Sonora. Speci- 
mens of the same species were collected by Dr. John L. LeConte at San Diego 
(Cal.) and San Francisco (Cal.) 
Scetororus PoinseTti1, B. and G.—~Sc. torquatus var. B. Wiegm.?—This 
species, although more intimately related to Se. torguwatus than to any other of 
the same genus, is nevertheless easily distinguishable from the latter by the form 
and structure of the scales on the middle region of the back, which are subcireu- 
ee 
