No. 2 
REPORT UPON REPTILES COLLECTED ON THE SURVEY'. 
BY EDWARD HALLOWELL, M. D 
CNEMIDOPHORUS GUTTATUS, Hallow. 
Sp. Char. —Head olive color, body greenish olive, with eight lines of the same color, interspaces upon sides brown ; sides 
presenting numerous white spots arranged in longitudinal rows; under surface dark blue, marked with white ; of anterior 
extremities deep blue; of posterior and tail white; scales of the body very small; sub-gular fold margined with a row of large 
smooth scales ; several smaller rows anterior to these; eight rows of scales upon the abdomen; sixteen femoral pores on each 
side very distinct. 
Dimensions. — Length of head one inch; greatest breadth five eighths; length of head and body to vent, three and a half inches; 
length of tail, four inches five-eighths; of anterior extremities, one inch one-eighth; of posterior, two inches two-eighths. 
Habitat. — Texas. 
Gen. Obs. —From C. sexlineatus, guttatus may be readily distinguished ; the scales upon the 
upper part of the body are larger ; allied to C. gularis, hut the latter has no spots. 
CROTALUS ORNATUS, Hallo well. 
Plate II. 
Sp. Char.— Three large plates in front of upper part of the head, on each side ; nasals large : posterior part of head covered 
with smooth scales; rostral rather large; eighteen supra-labials, the 6th, 7th and 8th the largest; a small plate between the 
rostral and first supra-labial, and anterior frontal; 27 rows of scales; ground color slate or greyish above with transverse brown 
lozenge-like bands, their external margins extending to the abdomen with intermediate yellow spots, and yellowish markings 
enclosed within the brown, sometimes ten in number ; the brown lozenge-like spots become indistinct posteriorly, and contain no 
yellowish spots, giving to this part of the upper portion of the body a sombre appearance, compared with the beautiful variegaied 
robe of the rest; about seventeen of these brown lozenge-like spots may be counted on the back; tail entirely black; throat 
and chin white; abdomen light straw color without spots, but shaded with greyish. 194 Abdom. scuta; 3 bifid post abdom. 
scut.; 19 sub-caud. 7 rattles belonging to the present specimen. 
Dimensions. —Breadth of head posteriorly 1 to 2£ inches; length of head ]§ inch; of body 3 feet 5 inches; of tail 2 inches ; 
of rattles 1 inch. 
Habitat. —Near Pecos river, northwestern Texas. 
Gen. Obs. —Differs from C. lecontii greatly in the arrangement of the plates upon the head ; in 
the ground color, which is yellow in lecontii; in the form of the dorsal spots, which are rhomboid 
in the latter and all distinct, without prolonged margins; and in the color of the tail, which in 
lecontii is handed, the two animals having no specific resemblance. In some respects it 
corresponds with the description of Crotcdus molossus, Baird and Girard, the latter having, 
according to them, brown lozenge-colored spots, with angles extending to the abdomen, and 
two yellowish spots in the centre, also in the scales, being each of the same color throughout; 
but the head is not quadrangular, and the ground color of molossus is represented as roll 
sulphur. In C. ornatus the sixth, seventh, and eighth superior labial plates are the largest; 
in molossus , the fifth and sixth. 
