304 CLASS XV. 



Callisaurus BLAINV., DUM. and BIBR., Megadactylus FITZ. 

 Head scutellate, short. Palatine teeth none. Scales small, smooth, 

 imbricate. Throat folded longitudinally, expansile; jugular fold 

 transverse. Row of femoral pores. Toes slender, elongate. Tail 

 shorter than trunk, depressed beneath. 



Sp. Callisaurus draconoides BLAINV., Nouv. Ann. du Museum, iv. 1835, PL 

 24, fig. 2. North America, California. 



CopJwsaurus TKOSCH. 



A genus much resembling the preceding, but distinct from it and the 

 other congeners in having the membrane of tympanum covered, and in the 

 defect therefore of auditory pore. Sp. Cophosaurus texanus TEOSCHEL, 

 Archivf. Naturgesch. 1850, s. 388, Taf. vi. 



Hypsibatus WAGL., WlEGM. 



Ophryoessa BOIE. Head short, covered with subequal scutella. 

 Anterior teeth subulate, posterior compressed, triangular, tricuspi- 

 date. Palatine teeth distinct. Throat folded longitudinally, not 

 expansile into a sac; jugular fold transverse. Femoral pores none. 

 Scales small, keeled, imbricate. Crest running above the back and 

 the very long, compressed tail. 



Sp. Ophryoessa superciliosa BOIE, Lacerta superciliosa L., SEBA Thesaur. I. 

 Tab. 96, fig. 6, n. Tab. 14, fig. 4, Lophurus xipkosurus SPIX, Lacert. Tab. 

 ro, GUERIN Iconogr., Rept. PI. 8, fig. i ; Brasil, Surinam. 



Cyclura HARLAN (Ctenosaura WIEGM. previously). Head 

 covered with scutella. Anterior teeth conical, posterior tricuspid, 

 compressed. Palatine teeth distinct. Skin of throat lax, folded 

 transversely, not inflatable. Jugular fold transverse. Membrane 

 of tympanum superficial. Serrated, low crest, formed of erect 

 triangular scales along the middle of back and tail. Scales very 

 small; tail very long with scales larger, aculeate, verticillate. 



Sp. Cyclura pectinata WIEGM., Herpet. Mexic. Tab. 2 ; Cyclura denticulate 

 WIEGM. 1. 1. Tab. 3, Cyclura acanthura BLAINV. Nouv. Ann. du Mus. iv. 

 PI. 24, fig. i, &c. 



Brachylophus Cuv. Head covered with scutella very small, 

 flat, numerous, subequal. Skin of throat lax, pendulous. Palatine 

 teeth. Scales of back granulous, small, scales of feet, belly and 

 tail carinate. Tail very long. Femoral pores. Low pectinate 

 crest along the middle of back and base of tail. 



