98 3. IGUANIDM 



of neck, bearing numerous spinose tubercles. Scales on 

 back and sides small, largest medially and on strong lateral 

 fold, smooth or slightly spinose medially, laterally some- 

 limes keeled and usually ending in an obtuse spine. Dor- 

 sals 20 to 25 to a head length. Ventral scales smooth, 

 smaller than dorsals, about 108 to 125 rows between gular 

 fold and anus. Tail little longer than head and body, 

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

 strongly keeled, spinose scales 5 about 35 to 48 scales in a 

 whorl at largest part of tail. Scales on fore and hind 

 limbs rather obtusely spinose, sometimes keeled on distal 

 part of scale. Femoral pores very large in males, small in 

 females, varying in number from 12 to 17; average in 66 

 thighs, 14.62. 



The ground color above is brownish, yellowish or green- 

 ish olive, sometimes with a yellowish middorsal band, 

 spotted, marbled, or cross-banded with reddish or blackish 

 brown. The head, tail and limbs are unicolor, or the tail 

 may be faintly cross-banded with darker brown. The ven- 

 tral surfaces are dull brownish or greenish yellow, more 

 or less clouded, marbled or spotted with dark brown, espe- 

 cially on the throat. 



Ltngth to anus 162 187 192 194- 195 210 



Length of tail 198 216 2+0 220 226 



Snout to orbit 12 13 16 15 13 16 



Snout to ear 30 33 38 37 33 +1 



Width of head-.. 28 28 34- 32 30 37 



Fore limb 70 66 78 80 75 78 



Hind limb 98 9+ 108 116 103 112 



Base of fifth to end of 



fourth toe 33 30 38 35 32 37 



Remarks. — This species is intermediate in size, color, 

 and scale characters between S. hispidus and S. ater. Speci- 

 mens from the three islands where it occurs seem to be 

 indistinguishable. 



