IGUANIDX, 3 
shield-like disposition. An enlarged scale is usually present, repre- 
senting the interparietal of other Lizards, and, through fusion with 
adjacent scales, sometimes acquires a remarkably large size. Fol- 
lowing the example of previous authors, and for convenience, I have 
used the term “ occipital ” for this shield, although it is not homo- 
logous with that so-called ; but I have had to depart from this rule 
in dealing with the genus Ziolemus, in which, owing to the greater 
development of the parietals and the presence of a true occipital, 
that terminology might have led to confusion. 
The habits of the numerous members of this family are as varied 
as their physiognomy. All the forms which we have observed in the 
Agamoids are repeated here, save the parachute-bearing Dragons, 
which have no pleurodont analogues. On the other hand, such types 
as the Anoles, with their digital expansions, and the semi-marine 
algivorous Amblyrhynchus, are unrepresented in the acrodont series. 
However, this apparent parallelism between the Agamoid and Igua- 
noid series of genera is very superficial, and there is, it appears to me, 
-not one form so exactly repeated in both as to deserve to be 
united into the same genus, were the character of the dentition, on 
which the family distinction is based, not to be considered. 
The great majority of Iguanoids are insectivorous; Jyuana, Bra- 
chylophus, Amblyrhynchus, Conolophus, Phymaturus, Sawromalus, 
Basiliscus, are herbivorous; and the Ctenosawra are reported to be 
omnivorous. Some species of Sceloporus and Phrynosoma are at 
present the only Iguanoids known to be ovoviviparous. 
With the exception of two genera occurring in Madagascar, and 
one in the Friendly and Fiji Islands, the range of this family is 
restricted to the New World. 
Synopsis of the Genera. 
I. Femoral pores absent (or a few present, in the male sex only, in 
the genus Enyalioides). 
A. Digits more or less dilated or depressed, with smooth trans- 
verse lamelle inferiorly, the distal joint narrower, cylindrical 
or compressed. 
1. Distal joint raised above the penultimate. 
Lateral teeth with subspherical crowns; palatine and pterygoid 
bones toothed .......-.+ se ee 1. Chameleolis, p. 7. 
Lateral teeth tricuspid ; tail prehensile. ; 
: : 2. Kiphocercus, p. 8. 
1 teeth tricuspid ; tail not prehensile. 
ee 3. Anolis, p.11. — 
2. Distal joint not raised. 
Digits scarcely dilated..........-. 4. Norops, p. a Beene 
B 
