218 IGUANID-E. 



ft. Occipital not broader than the parietals. 



Occii:)ital broader than long and as broad 



as the parietals ; anterior border of ear 



feebly denticulated 8. meJanorltiniis.'p. 225. 



Occipital as long as broad and narrower 



than the parietals ; auricular scales large . 9. zosteromus, j). 225. 



b. Dorsal scales forming slightlj' oblique longitudinal rows 

 converging towards the vertebral line. 



ft. Tail subcylindrical. 



Less than 50 scales between the occipital 



and the tail ; 9 scales correspond to the 



length of the head 7. dwjtsii, p. 224. 



Less than 60 scales between the occipital 



and the tail : 12 to 15 correspond to the 



length of the head 15. grammicus, p. 231. 



More than 60 scales between the occipital [p. 232. 



and the tail ; not larger than the ventrals. 16. microlepidotus, 



(3. Tail much compressed 19. 2-)yrrTioGephalus, 



[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 



mucronate 2. serrifer, p. 221. 



Head-shields keeled or striated 20. chn/sostictus,Y>.23o. 



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. ceneus, 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 difi'erentiated 

 from, the dorsals. 



A. Lateral scales squamous, imbricate ; 9 or more femoral pores 



on each side 21 . variabilis, p. 236. 



B. Lateral scales squamous, imbricate ; less than 9 femoral pores. 



Two canthal scales 22. siniferus, p. 237. 



One canthal scale; ventrals obtusely keeled. 23. fuJvus, p. 238. 

 One canthal scale; ventrals perfectly smooth, 24. sqnamosus, p. 238. 



