74 UNIVERSITY OF COLORADO STUDIES 



Trinidad and Greeley, A. E. Beardsley; reported by Cary, I.e., from both sides of 

 the range as Phrynosoma ornalissimum. 



Phrynosoma cornutum (Harlan) 

 Texas Horned Toad (Figure ij) 



Agama comuta Harlan, Journ. Acad. Nat. Set. Phila., Vol. IV, p. 299, 1825. 

 Phrynosoma cornutum — Cope, Rept. U.S.N.M., p. 435, 1898 (Pagosa and 

 Colorado Springs, Colo.). 



Horns long, the longest more than twice the diameter of the eye in 

 length; one short stout horn directed backward and outward from the 

 posterior end of each can thus rostratus; three from the temporal 

 region on each side pointing outward and backward, of these the ante- 

 rior is the shortest, the middle one the longest and the posterior one 

 just equal to or usually slightly shorter than the middle one; two 

 large occipital horns, one on each side, directed upward and somewhat 

 backward, these being the largest of the horns; a small, median 

 occipital horn. 



Two rows of elevated pointed scales on each lateral margin of the 

 body; dorsal scales of various sizes, many large, flattened, keeled and 

 elevated ; scales on ventral parts more or less distinctly keeled. 



Nasal openings between the canthi rostrati; gular folds prominent 

 and covered with keeled scales. 



Length of the head 1.25 to 1 . 75 in the width of the head, almost 

 3 in the maximum width of the body; tail long, about equal to the 

 maximum width of the body in length. 



Color grayish brown to blackish brown, subject to much variation; 

 usually twelve, more or less distinct spots of a slightly darker color 

 than the ground color may be seen on the dorsal surface; below 

 whitish; tail irregularly marked above; a median dorsal stripe lighter 

 than the ground color. 



Size moderately large, average specimens 125 mm. or larger. 



This species, unlike the other members of this genus, is oviparous. 

 Strecker, 1 who has studied the egg-laying habits of this lizard, finds 

 that it lays about two dozen eggs in a burrow some six or seven inches 



> Proc. Biol. Soc. Wash., Vol. XXI, pp. 165-168, 1908. 



