30 IGUANID.E. 
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. Gular 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, obtusoly 
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 antefemorals, 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 lamelle under phalanges 1. and i1r. 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 
anteriorly, on 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. 
TRC ore use sept es oben away 36 CO, 
Width of head ......., 24, 
BOY) this ateia Stiageaceeaes EG?) 55 
Fore limb ............ 52 a, 
Hind limb............ 85, 
TOES asascee eg gerort arene 26 —=C«, 
Ee eiall  Gg ascents ch wo es 180, 
West Indies (Dominica, Guadeloupe, Nevis, 8. Eustacius). 
ad. Guadeloupe. Type of Xtphosurus ferreus. 
b. 9. Cuadetoige ae is ili 
c-d. § & yg. Dominica, G. F. Angas, Esq. [P.]. 
e-h, So. Dominica. 
ud. Nevis. T. Cottle, Esq. [P.]. 
ke 9. Pe (Type of A. reticulatus.) 
1. Her. od. —? (Type of A. alliaceus.) 
m. Hgr. 3. caemat Bristol Museum [P.]. 
n,0,p. & & her. —? 
