220 REPORT OF NATIONAL MUSEUM, 1898. 



Femoral 2)ores. 



Tail with whorls of spiny 



scales. Hoplocercus. Uromastix. 



Tail long, simple; scales 



small. Crotaphytus. Liolei>is. 



Tali simple, scales large. Sceloporus. * * 



No femoral pores ; preanal pores. 



Tail with whorls of spines. * # * Stellio. 



Tail, simple, not elongate, 



ear open, Proctotretus. Agama. 



Neither femoral nor anal pores. 



Much flattened, tail short, scales irregular. 

 Ear exposed. Phrynosoma. Moloch. 



Ear concealed. (Doliosaurus, s. g.) S M^^liSw"*'' 



1 



\ Megalochilus. 



IGUANIDAE. 



Iguaniens Cuvier, part, R&gne Anim., II, 1817, p. 29. 



Ascalahotce Merreai, part, Tent. Syst. Amph., 1820, p. 39. 



Ptteustoidw, Agamoidea, Fitzinger, part, Neue CHassif. Rejit., 1826, p. 11. 



Iguanidw Gray, Phil. Mag. (2), II, 1827, p. 56. 



Pachyglossw Wagler, part, Syst. Amph., 1830, p. 144. 



Dendrohatce prosphyodontes and Humivagw prosphyodontes Wiegmann, Herp. 



Mex., 1834, pp. .5, 18. 

 Iguaniens pUnrodontcs Dumeril and Bibron, Erp. Gen., IV, 1837, p. 61. 

 Cory thoph ana', Hypsllophi, Ptychosauri, Polychri, Dactyloie, Vravontiirw, Heter- 



tropides, Steirolepides, Doryphori, Phrynosomata Fitzinger, Syst. Rept., 1843. 

 Ignanidce Gray, Cat. Liz., 1845, pp. 5, 178. 



Anolidw, Iguanidw Cope, Proc. Acad. Nat. Sci. Phila., 1864, p. 227. 

 Iguanidw Boulenger, Ann. Mag. Nat. Hist. (5), XIV, 1884, p. 118. — Boulenger, 



Cat. Liz. Brit. Mus., 2d ed., 1885, II, p. 1. 



Osteological characters of this family are as follows : 



Teeth pleurodoiit, the roots anchylosed to the internal side of the 

 premaxillary and maxillary bones. Premaxillary not cut off from max- 

 illa-palatines by maxillaries. 



Splenial well developed; Meckelian groove mostly closed; angular 

 little developed on inner, much on outer side of ramus; coronoid pro- 

 duced anteriorly, not posteriorly, on outer face of ramus. 



Vertebra? proccBlous. 



The varieties of visceral structure in this family are not very great. 

 In the especially herbivorous genera the colon is much enlarged in 

 diameter, and in Iguana it is divided by numerous partial septa. The 

 liver generally has but a single posterior emargination, but in Anolis, 

 Microlepis, Crotaphytus, and Phrynosoma there are two incisions, thus 

 producing a short median lobe. The border is variously excavated to 

 accommodate the folds of the small intestine and colon. Thus in IIol- 

 brooMa, Crotaphytus, Lwmanctus^ Sceloporus, TJta, and some Phrynoso- 

 mata, the border is deeply concave to the right of the middle line. In 

 Liocephalus, Liolamns, Callisaurus, and some Scelopori, and Phrynoso- 

 mata it is deeply excavated medially. 



