100 3. IGUANID.^ 



fold covered with very small scales. Ear-opening large, 

 almost vertical, with strong anterior denticulation of spi- 

 nose scales. A strong fold on each side of neck bearing 

 numerous spinose tubercles. Scales on back and sides small, 

 largest medially, ending posteriorly in an obtuse spine. 

 Dorsals 1 5 to 20 to a head-length. Ventral scales smaller 

 than dorsals, about 113 to 119 rows between gular fold 

 and anus, smooth or with the outer posterior corner some- 

 what projecting. Tail little longer than head and body, 

 conical, very stout, and covered with whorls of large, keeled 

 scales many of which are strongly spinose, especially on 

 basal half of tailj about 43 to 50 scales in a whorl at largest 

 part of tail. Scales on fore and hind limbs strongly spinose, 

 and keeled on distal part of scales. Femoral pores very 

 large in males, small in females, varying in number from 

 12 to 16 j average in 40 thighs, 13.67. 



All the upper surfaces in adults are olive, dark brown 

 or dull brownish black without markings or with a few 

 small brown spots, while young are speckled with scattered 

 scales of grayish yellow on a brown or olive ground and 

 sometimes are cross-barred dorsally on the body with dark 

 brown. The tail in adults may be unicolor or show traces 

 of cross-bands. These cross-bands are very distinct in the 

 young. The ventral surfaces are blackish, dark brown, or 

 yellowish brown, sometimes speckled with dark brown. 



Length to anus 103 273 281 283 288 298 



Length of tail 98 286 280 286 305 305 



Snout to orbit 9 19 21 21 2! 23 



Snout to ear 20 49 47 50 5 5 52 



Width of head.._ .-..„- 17 44 46 46 53 49 



Fore limb 44 109 104 114 116 114 



Hind limb 63 157 146 157 161 159 



Base of fifth to end of 



fourth toe 20 49 47 52 52 52 



