224 REPORT OF NATIONAL MUSEUM, 1898. 



The characters of the genera are as follows: 



I. ANOLIN^. 



A. Nostrils above the canthiis rostralls; digits more or less dilated or depreBsed, 

 with smooth transverse laraelhe below. No femoral pores. 

 a. Distal joint of digits raised above the penultimate. 



Lateral teeth, with subspherical crowns; palatine and pterygoid bones 



toothed Chamceleolis Coctean. 



Lateral teeth tricuspid; tail prehensile Xiphocercus Fitzinger. 



Lateral teeth tricuspid; tail not prehensile; no rostral appendage. 



Anolis Daudin. 

 Like Anolis, but muzzle with a flexible appendage.. AScj/iomi/c^erMs Cope. 

 aa. Distal joint not raised. 



Digits scarcely dilated Norops Wagler. 



AA. Nostrils below the canthus rostralis; digits not dilated, and with keeled lamel- 

 lae inferiorly. Femoral pores. 

 No gular fold nor dorsal crest; third and fourth toes equal. 



Polychrus Cuvier. 

 II. BASILISCIN^. 



Toes with a free dermal border; back, tail, and head with compressed tegumentary 

 crests supported by the skeleton ; no femoral pores or large gular sac. 



Basiliscus Laurenti. 



Toes without free dermal border; no dorsal or caudal crest; skull produced horizon- 

 tally behind ; no femoral pores or large gular sac Lcemanctus Wiegmann. 



III. IGUANIN.E. 



A. Femoral pores absent (or a few present in the male of Enyaliodes; Bonlenger), 

 1. Premaxillary teeth conical. 



a. Infradigital lamelhT? distinctly keeled. 



a. Posterior part of head more or less produced. A gular sac; head with two 

 ridges uniting posteriorly into an elevated bony crest. 



Corytlwplianes Boie. 

 /?. Head not produced posteriorly. 



* One or more transverse gular folds, or a very largo occipital (or interpa- 

 rietal) shield. 

 t Sternum without fontanelle. 



\ Body more or less compressed ; a dorsal crest. 



No abdominal ribsj no gular sac; no femoral pores, 



Ophryoi'ssa Fitzinger. 

 Abdominal ribs; male with a more or less developed gular sac and 



usually a few femoral pores Enyalioides Bonlenger. 



{} Body depressed. 



A dorsal crest; toes denticulated laterally Chalarodon Peters. 



No dorsal crest ; toes compressed Hoplurua Cuvier. 



No dorsal crest; toes depressed, denticulated laterally, 



Pristidactylua Fitzinger. 

 tt A sternal fontanelle; occipital shield very large. 

 t Caudal scales small or moderately large. 



Digits straight; no canine-like teeth Tropidurus Wiegmann. 1 



Digits strongly bent at the articulations; anterior maxillary teethl 



longest Uran iscodon Kaup. 



tt Caudal scales very large and spinose. 



No fold across the throat ; tail subcylindrical. .StrobUurus'Wiegma.Jiu. 

 Two folds across the throat ; tail flat Urocentron Kaup. 



