294 ZOOLOGY. 
Found on the edges of the prairies and in the more open portions of the forests. It appears 
to choose the neighborhood of rotten logs. It is quite active, running and dodging about as 
nimbly as a squirrel, — S. 
SCELOPORUS GRACIOSUS, Baird & Girard. 
Tlic Slender Pence Lizai-d. 
S. fjraciosm, B. & G. Proc. Acad. Nat. Sc. Phil. VI, Apr. 1852, p. G9.— Ib. Ex. to Great Salt Lake, 1852, p. 346 ; pi. v, 
fig. L 
S. gracilis, B. & G. Proc. Acad. Sc. Phil. 1852, p. 175.— Giraed, Hcrpet. U. S. Expl. Exp. 1858, p. 386 ; pi. xx, fig. 1 !>. 
Sr. Cii. — Cephalic plates smooth; anterior parietal larger than vertex plate; middle occipital very large, pentagonal. 
Post-anal scales large, sub-lanceolate, smooth, posteriorly notched. Posterior surface of thighs covered with small, rounded, 
smooth scales. Olivaceous above, with a double series of crescent-shaped black spots on the back and two lateral light 
streaks, between which is a row of black spots. Beneath, yellowish ; under surface of head clouded with bluish. Malt? 
with an elongated blue patch on each side of the abdomen. 
Found at the Dalles, Oregon Territory, or at Steilacoom. At Fort Dalles they live in the 
cracks of the basaltic rocks, "which their colors resemble in tint, being darker than those at 
Steilacoom. They usually emerge from their hybernation about the middle of March. — S. 
CROTAPHYTUS WISLIZENII, Baird & Girard. 
C. wislizenii, B. & G. Pr. Acad. Nat. Sc. Phila. VI, Apr. 1852, p. 69.— Ic. Ex. to Great Salt Lake, 1852, p. 340 ; pi. iii. 
C. gambcUi, B. & G. Pr. Acad. Nat. Sc. Phila. VI, 1852, p. 126. 
C. fasciatus, Hallowell, Pr. Acad. Nat. Sc. VI, 1852, p. 207. — Ib. Sitgreaves Ex. to Zuui, 1853, p. 115 ; pi. v. 
Sp. Cii. — Head proportionately narrow and elongated. Cephalic plates and scales on the back very small. Yellowish 
brown, spotted all over with small patches of deep brown or black, becoming partial or complete rings on the tail. 
Found at the Dalles, Oregon Territory, and up Snake river, near Fort Boise. — S. 
TAPAYADOUGLASSII, Girard. 
The Oregon Horned Toad. 
Agama douglassd, Bell, Trans. Linn. Soc. London, XVI, 1833, 105 ; pi. x. — Haelan, Med. & Phys. Researches, 1835, 
141, fig. 3. 
Phrynosoma douglassii, Wagl. Natural Syst. Amph. 1820, 146. — Holbrook, N. A. Herpet. II, 1842, 101 ; pi. xiv. — 
GiKAKD, Stansbury's Ex. to Salt Lake, 1862, 361 and 362 ; pi. vii, figs. 6-10. 
Tapaija douglassii, Gibard, U. S. Expl. Exp. Herpet, 397 ; pi. xxi, figs. 1-5. 
gp. c'li. — Head large, depressed ; vertex slightly declivous ; snout sub-convex or rounded, sub-depressed at the nostrils. 
Cephalic plates moderate, very rugo=e, occipital and temporal spines reduced to small acerated cones. Sub-maxillar shields 
moderate and ridged. Auricular aperture granular, sub-tubercular, or sub-denticulated in front. Labial plates moderate. 
Mental scales small and unequal ; gular folds minutely scaly. Abdominal scales moderate, sub-rhomboid, posteriorly 
obtuse. Fermoral pores distant ; the series from either side approximating upon the inter-femoral region without being 
continuous. 
I obtained numerous specimens of this singular animal in the vicinity of the Yakima river, 
in August, and saAV them as far as latitude 48° 30' north, on the open plains, usually among 
rocks and sand. They all had the gray color which they retain in alcohol, excepting one, 
which was of a brick red on the back, but beneath white, like the rest. These colors resemble 
those of the stones among which they live, and it is supposed by some that they have the" 
power of changing their hue like the chameleon, and like the better known tree toad of the 
Atlantic States. Though ferocious in appearance they are perfectly harmless; yet the Indians 
believe them to have the power of producing a poisonous wound with their blunt spines, and 
it is possible that such a wound, if made, might sometimes be troublesome. They do not 
attempt to bite, and are so slow in motion as scarcely to get out of the way. They are, no 
