HO 3. IGUANIDM 



e. — Lateroventral black bars in males ill-defined, 

 blurred or obsolete, often united below. 

 C. inusitatus. — p. 150. 

 e". — Lateroventral black bars in males well-defined, 

 intense, separate below, 

 f. — Tail longer, ratio of body to tail averages .728 

 to .855; femoral pores more numerous, average 

 16; general coloration lighter. 



C. ventralis ventralis. — p. 152. 

 £' . — Tail shorter, ratio of body to tail averages .807 

 to .815; femoral pores fewer, average 14; 

 general coloration darker. Northern Nevada. 

 C. ventralis myurus. — p. 164. 



21. Callisaurus crinitus Cope 

 Copers Gridiron-tailed Lizard 



Callisaurus dracontoiies Cope, Proc. U. S. N.it. Mus., 1889, p. 1+7. 



Callisaurus crinitus Cope, Araer. Natur.ilist, Vol. XXX, 1896, p. 1049 

 (type locality, Ballenas Bay, Lower California); Dickerson, 

 Copeia, No. 50, 1917, p. 97; Stejneger & Barbour, Check List 

 N. Amer. Amph. Rept., 1917, p. 47; Van Denburgh & Slevin, 

 Proc. Cal. Acad. Scl., Ser. 4, Vol. XI, 1921, pp. 51, 57; Nelson, 

 Mem. Nat. Acad. Sci., Vol. XVI, 1921, pp. 114, 115. 



Callisaurus rhodostictus Cope, Amer. Naturalist, Vol. XXX, 1 896, p. 1049 

 (type locality Lower California). 



Description. — Head rather short and low, with well 

 developed canthus rostralis. Nostrils large, opening on 

 upper surface of snout. Supraocular regions covered with 

 small plates and separated from each other by one or two 

 rows of slightly larger plates. Upper head plates (except 

 interparietal) small and irregular, largest on frontal and 

 prefrontal regions, everywhere smooth and but little con- 

 vex. Several subocular plates, middle one very long and 

 strongly keeled. Superciliaries rather small, but strongly 

 imbricate. Eyelids bearing a well developed fringe. Supra- 

 labials strongly imbricate, and produced laterally so as to 



