30 IGUANIDJi:. 



extending forwards as frontal series ; five to twelve enlarged, smooth 

 or feebly keeled supraocular scales, separated from the supraorbitals 

 by one row of granules ; occipital as large as or a little smaller 

 than the ear-opening, separated from the supraorbital semicircles by 

 one or two series of scales ; canthus rostralis sharp, canthal scales 

 three or four ; loreal rows four to six ; six or seven labials to below 

 the centre of the eye ; ear-opening moderately large, vertically sub- 

 oval. Grular appendage rather small, absent in the female ; gular 

 scales smooth or obtusely keeled. Body compressed in the male, 

 with a dorso-nuchal fold. Dorsal scales small, granular, obtusely 

 keeled, somewhat smaller still on the flanks ; a more or less marked 

 double series of enlarged scales on the dorso-nuchal fold, forming a 

 rather strong denticulation on the nape in the adult male ; ventral 

 scales larger than dorsals, much smaller than antcfemorals, hexa- 

 gonal, imbricate, smooth or feebly keeled. Limbs moderately long ; 

 the adpressed hind limb reaches the eye or the posterior border of 

 the orbit ; digital expansions well developed ; twenty-three to 

 thirty-two lamellse under phalanges ii. and iii. of the fourth toe. 

 Tail compressed, strongly in the male, covered with unequal-sized 

 keeled scales forming more or less distinct segments ; a caudal crest 

 is scarcely indicated by a slight denticulation in the female ; in the 

 half-grown male it is represented by a strong unequally-serrated 

 ridge, and in the full-grown male it assumes a fin-like appearance, 

 being supported by the much produced neural spines ; length of the 

 tail not twice that of head and body. Male with enlarged postanal 

 scales. Brownish or bluish grey above, uniform or spotted, or 

 vermiculated with black ; frequently a dark band, edged with white 

 anterioi'ly, ou each side of the head, extending to beyond the inser- 

 tion of the fore limb ; sometimes a series of black ocelli with white 

 centre on the side of the back ; full-grown male uniform dark-brown 

 above ; lower surfaces whitish, with metallic gloss. 



Total length 292 millim. 



Head 36 



Width of head 24 



Body 76 



Fore limb 52 



Hind limb 85 ,, 



Tibia 26 „ 



Tail 180 



>5 

 >5 



J) 



West Indies (Dominica, Guadeloupe, Nevis, S. Eustacius). 



a. (S . Guadeloupe. {Ty^e of Xip/tosurus ferreus.) 



b. 2 . Guadeloupe. 



c-d. S & yg. Dominica. G. F. Angas, Esq. [P.]. 



e-h. (5 . Domiuica. 



i. S- Nevis. T. Cottle, Esq. [P.]. 



Ti. $. ? (T^j-^e oi A. reticulatus.^ 



I. Hgr. S ■ ? (Type of A. afliaceus.) 



m. Hgr. cJ . ? Bristol Museum [P.]. 



n, o,p. (S & hgr. ? 



