218 IGUANID.E. 
B. Occipital not broader than the parietals. 
Occipital broader than long and as broad 
as the parietals; anterior border of ear 
feebly denticulated ................ 8. melanorhinus, p. 225. 
Occipital as long as broad and narrower 
than the parietals; auricular scales large. 9. zosteromus, p. 225. 
b. Dorsal scales forming slightly oblique longitudinal rows 
converging towards the vertebral line. 
a. Tail subcylindrical. 
Less than 50 scales between the occipital 
and the tail; 9 scales correspond to the 
length of the head .................. 7. dugesii, p. 224. 
Less than 60 scales between the occipital 
and the tail; 12 to 15 correspond to the 
length of the head...............04. 15. grammicus, p. 231. 
More than 60 scales between the occipital [p. 232. 
and the tail; not larger than the ventrals. 16. microlepidotus, 
(. Tail much compressed ...... 19. pyrrhocephalus, 
[p. 235. 
2. The distance between the base of the fifth toe and the 
extremity of the fourth equals that between the nostril and 
the arm. 
Head-shields smooth ; dorsal scales strongly 
MHUCTONALG: ae ceca seek SW a daw aoe He 2. serrifer, p. 221. 
Head-shields keeled or striated.......... 20. chrysostictus, p.235. 
B. Lateral scales longitudinal or nearly so; the series of femoral 
pores meeting medially. 
Tibia usually a little shorter than the 
shielded part of the head; the distance 
between the base of the fifth toe and the 
extremity of the fourth does not exceed 
the distance between the end of the snout 
and the posterior border of the ear .... 17. eneus, p. 233. 
Tibia usually a little longer than the 
shielded part of the head ............ 18. scalaris, p. 234. 
II. Lateral scales much smaller than, and abruptly differentiated 
from, the dorsals. 
A. Lateral scales squamous, imbricate; 9 or more femoral pores 
On Gach) SIME. seca aeaarnareareware 21. variabilis, p. 236. 
B. Lateral scales squamous, imbricate ; less than 9 femoral pores. 
Two canthal scales ..............000. 22. siniferus, p. 237, 
One canthal scale; ventrals obtusely keeled. 23. fulvus, p. 238. 
One canthal scale ; ventrals perfectly smooth. 24. squamosus, p. 238. 
