l82 VERTEBRATE ANIMALS OF THE UNITED STATES 



Family i. Gekkonidae. — Geckos. Mostly small lizards with a 

 soft skin covered with minute granular scales; digits usually flattened 

 with adhesive disks; eyes large: 60 species, all tropical; 5 species in the 

 United States, some adventitious, S pharodactylus cinereus ^Mac Leay, 

 a Cuban species, and Hemidaciylus turcicus (L.), a ^Mediterranean 

 species, having become established at Key West. 



I. Sphaerodactylus Wagler. Digits expanded at their tips and 

 without claws: 20 species in Mexico,- Central America and the West 

 Indies. 



S. notatus Baird. Reef gecko. Body very small, 60 mm. long; 

 color brownish yellow, with scattered reddish brown spots; scales on 

 back strongly keeled: southern Florida, Cuba and Bahamas. 



Fig. 100. — Coleonyx . - ni Dilmars). 



2. Coleonyx Gray. Digits not dilated, with very small claws: 

 3 species. 



C. variegatus (Baird). The banded gecko (Fig. 100). Body small, 

 130 mm. long, yellow in color, and either with about 13 broad brown 

 transverse bands or with brown spots and blotches: Texas to Cali- 

 fornia; rather common; not poisonous, although often so thought. 



Family 2, Iguanidae. — Iguanas; swifts. Tongue thick and non- 

 protactile; scalation line; teeth pleurodont; femoral pores usually 

 present; eyelids well developed; pupil round: 50 genera and over 300 

 species, all American except a few East Indian, and tropical and sub- 

 tropical; mostly insectivorous; 50 species in the United States. 



Key to the Genera of Inguanidae 



ai Femoral pores absent, toes flattened (Fig. loi) i. Anolis. 



,a2 Femoral pores present, toes not flattened. 



bi A middorsal crest of enlarged scales present 2. Dipsosaurus. 



hi No middorsal crest of enlarged scales present. 

 Ci Body lizard-like, head without horns. 



di Tail blunt, superciliary scales not imbricate 3. Saiiromahis. 



d2 Tail long and attenuate; superciliary scales imbricate. 



