IGUANID., 
an 
** No transverse gular fold ; occipital shield small. 
t A gular appendage. 
Body compressed ................ 5. Tropidodactylus, p. 97. 
Tt No gular appendage. 
+ Males with anal pores. 
Dorsal scales smooth and juxtaposed 23. Helocephalus, p. 187, 
Dorsal scales keeled and imbricate,. 24. Liolemus, p. 138. ~ mo 
tt No anal pores. 
§ Caudal scales forming verticils. 
Abdominal ribs ; dorsal and ventral scales large and keeled. 
18. Scartiscus, p. 127. 
No abdominal ribs .............. 21. Stenocercus, p. 131. 
§§ Caudal scales not forming verticils. 
No abdominal ribs ; body slightly depressed; head-scales small and 
keeled. c.ccvay ey chededs aonb ens 25. Saccodeira, p. 158. — ~ 
Abdominal ribs; body more or less compressed. 
26. Liocephalus, p. 160. — 
6. Infradigital lamella smooth or indistinctly keeled. 
a. A transverse gular fold; no anal pores. 
* Body cylindrical or feebly compressed. 
A slight dorsal crest or denticulation. 
12. Enyalius, p. 117. —— 
No crest ; dorsal lepidosis heterogeneous. 
13. Anisolepis, p. 122. —__ 
No crest; dorsal scales uniform, granular. 
14. Urostrophus, p. 123:—~ 
** Body depressed; no dorsal crest. 
Lateral teeth tricuspid............ 15. Liosaurus, p. 124.-— 
Lateral teeth with obtuse or subspherical crowns. 
16. Diplolemus, p. 125. 
p. No gular fold ; male with anal pores. 
22. Ctenoblepharis, p. 136. 
2. Premaxillary teeth tricuspid. 
Body much depressed ........+... 31. Phymaturus, p. 184. 
