404- 3. IGUANIDM 



1887, p. 39; Stejneger, N. Amer. Fauna, No. 7, 1893, p. 187; 

 Van Denburgh, Proc. Cal. Acad. Sci., Ser. 1, Vol. 4, Part i, 1894, 

 p. 296; Van Denburgh, Proc. Cal. Acad. Sci., Ser. 2, Vol. 5, 1895, 

 p. lis; Cope, Report U. S. Nat. Mus. for 189S, 1900, p. 430 (part); 

 McLain, Contrib. Neotropical Herpetology, 1899, p. 2; Mocquard, 

 Nouv. Arch. Mus. Hist. Nat. Paris, Ser. 4, Vol. I, 1899, p. 314; 

 Bryant, Univ. Cal. Pubis. Zool., Vol. 9, No. i, 191 1, p. 5; Stej- 

 neger & Barbour, Check List N. Amer. Amph. Rept., 1917, p. 

 58; Van Denburgh & Slevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. 

 XI, 1921, pp. 51, 62; Nelson, Mem. Nat. Acad. Sci., Vol. XVI, 

 1921, pp. 114, 115; Terron, Mem. y Rev. Soc. Cient. Antonio 

 Alzate, Vol. 39, 1921, pp. 165, 166. 

 Phrynosoma {Batrachosoma) coranatiim. Fitzinger, Syst. Rept., 1843, 



P- 79- 

 Phrynosoma sp., Baird, Proc. Acad. Nat. Sci. Phila., 1859, p. 299. 

 Phrynosoma cornutum Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, 



pp. 66, 67 (part); Belding, West Amer. Scientist, Vol. Ill, No. 



24, 1887, p. 98; Stejneger, N. Amer. Fauna, No. 7, pi. II, figs. 



i-ic. 

 '^hrynosoma asio Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, p. 67; 



Boulenger, Cat. Lizards Brit. Mus., Vol. II, 1885, p. 244 (part); 



Belding, West Amer. Scientist, Vol. Ill, No. 24, 1887, p. 98. 



Description. — Nostrils pierced in lines joining supercil- 

 iary ridges with end of snout. Several longitudinal series 

 of large, pointed gular scales, the exterior continued back 

 upon gular folds. A series of about five very large, pointed 

 sublabial plates. A broad spine below the rictus, usually 

 without any, but sometimes with a very small spine behind 

 it. Head spines very large in adults; four temporals, one 

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

 interoccipital. Occasionally small spines are developed 

 between the temporals. A row of four or five spinose scales 

 in front of occipital spines. Other head scales, with few 

 exceptions, flat and rugose, usually with irregular ridges 

 radiating from near center of each scale. Two groups of 

 spines on each side of neck, lower larger. Tail bordered 

 with a single row of lateral spines, and with a group of 



