13. PHRYNOSOMA 389 



Phrynosoma blahivillii blainvillii Grinnell & Camp, Univ. Cal. Pubis. 

 Zool., Vol. 17, No. 10, 1917, p. 164; CowLES, Journ. Entomol. & 

 Zool., Pomona College, Vol. XII, No. 3, 1920, p. 66; Van Den- 

 burgh &Slevin, Proc. Cal.Acad. Sci.,Ser. 4,Vol.XI, i92i,pp. 51,62. 



Description. — Nostrils opening on lines joining supercil- 

 iary ridges with end of snout. Head-spines large; three to 

 six temporals, one occipital, and one postorbital on each 

 side, and one small interoccipital. Sometimes with small 

 spines above and between temporals, and often in front of 

 occipital spines. Temporal scales with ridges running in 

 the general direction of temporal spines. Other upper head 

 scales convex and almost or quite smooth, some of the cen- 

 tral ones usually largest. Several longitudinal series of 

 gular scales enlarged and spinose, but becoming smaller 

 toward median line, and continued on gular fold or folds. 

 A series of five or six spinose sublabials often continued pos- 

 teriorly by smaller plates. Below corner of mouth, a very 

 broad spine followed by a long slender one. Two groups of 

 spines on each side of neck, lower usually larger. Back and 

 tail with large, scattered, somewhat elevated, keeled, tu- 

 bercular scales, between which are smaller scales and 

 granules. Two rows of peripheral spines; lower series 

 shorter than upper, and composed of smaller spines. Tail 

 edged with a single row of lateral spines, and bearing a 

 small group of slender spines just behind thigh. Scales on 

 anterior surfaces of limbs large, pointed and strongly keeled. 

 Those on chest, abdomen and proximal part of ventral sur- 

 face of tail smooth, but those on terminal portion of tail 

 keeled. Tympanum not covered with scales. Long series 

 of (12 to 18) femoral pores present. Males usually with 

 enlarged postanal plates. 



The ground color above is brownish, yellowish, reddish, 

 or grayish, usually darker laterally. A large brown patch 



