REPTILES 193 



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

 skin covered with minute granular scales; digits usually flattened and 

 with adhesive disks; eyes large and without hds; vertebra? amphi- 

 coelous: 60 species, all tropical; 4 species in the United States, some 

 adventitious, Sphdrodactyliis cinereus Mac Leay, a Cuban species, and 

 Ilcmidactylus turcicus (L.), a Mediterranean species, having become 

 established at Key West. 



Sphaerodactylus Wagler. Digits expanded at their tips and without 

 chiws: 20 species in Mexico, Central America and the West Indies. 



Fig. 100. — Coleonyx variegalus {from Dilmavs). 



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

 30 mm.; color brownish yellow, with scattered reddish brown spots; 

 scales on back strongly keeled: southern Florida, Cuba and Bahamas. 



Family 2. Eublepharidae. — Geckos. Similar to the Gekkonidce; 

 eyes large, with movable lids; vertebrae procoelous: 7 species, 2 in the 

 United States. 



Coleonyx Gray. Digits not dilated, with very small claws : 3 species. 



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

 75 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 3. Iguanidae. — Iguanas; swifts. Tongue thick and non- 

 protractile; scalation fine; teeth pleurodont; femoral pores usually 

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

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

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



Key to the Genera of Iguanidae 



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



a-: Femoral pores present, toes not flattened. 



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



