396 3. IGUANID& 



Phrynosoma blainvillii frontale VAN DENBURGH, Occas. Papers Cal. Acad. 

 Sci., V, 1897, P- 95; BRYANT, Univ. Cal. Publs. Zool., Vol. 9, No. i, 

 1911, pp. 5, 38, pi. 5; VAN DENBURGH, Proc. Cal. Acad. Sci., Ser. 

 4, Vol. 3, 1912, p. 148; GRINNELL & CAMP, Univ. Cal. Pulbs. Zool., 

 Vol. 17, No. 10, 1917, p. 165. 



Distribution. Nostrils open on lines joining the super- 

 ciliary ridges with end of snout. Head-spines usually a 

 little smaller than those of P. b. blainvillii ; three to six 

 temporals, one occipital, and one postorbital on each side, 

 and one small interoccipital. Small spines sometimes pres- 

 ent above and between temporals, and usually in front of 

 occipitals. Temporal scales with ridges running in the gen- 

 eral direction of temporal spines. Other upper head scales 

 nearly equal-sized, flat, each with numerous ridges and 

 granulations usually darker than ground color of head. 

 Several longitudinal series of gular scales enlarged and 

 spinose, but becoming smaller toward median line, and con- 

 tinued back onto gular fold or folds. A series of five or six 

 spinose sublabials, often continued posteriorly by smaller 

 plates. Below corner of mouth, a very broad spine fol- 

 lowed by a long slender one. Two groups of spines on 

 each side of neck, lower usually larger. Back and tail bear- 

 ing large, scattered, elevated, keeled, tubercular scales, be- 

 tween which smaller scales and granules. Two rows of peri- 

 pheral spines; lower series shorter than upper, and com- 

 posed of much smaller spines. Tail bordered with a single 

 row of lateral spines, and having a small group of slender 

 ones just behind thigh. Scales on anterior surfaces of limbs 

 large, pointed and strongly keeled. Those on chest, belly, 

 and proximal part of the tail, smooth, but those on terminal 

 part of tail, keeled. Tympanum not covered with scales. 

 Lone: series of twelve to eighteen femoral pores. Males 

 usually with enlarged postanal plates. 



