XIV INTRODUCTION. 
with the noose, the arrow, or the gun. The range of Basiliscus also extends 
northward into Southern Mexico. Crested on head, back, and tail, slender 
and spider-like in build, in novelty of appearance it rivals the Chlamydo- 
saurus. In some genera, as Polychrus and Sphaerops, the skin is to such 
an extent unprotected by the scales or granulations as to allow the tran- 
sient color variations to be very noticeable. 
Nine or ten genera of the family are found north of Central Mexico. 
Only one, in a single species, Sceloporus undulatus, occurs east of the Mis- 
sissippi. The undulated lizard ranges northward from the Gulf as far as 
Southern Tlinois and Maryland. It is common in parts of Kentucky and 
Virginia. Phrynosoma, a viviparous genus, ranges from Mexico to Dakota; 
it contains nine species, none of which appear East of the plains. One, 
P. douglassii, is common in Southern Dakota, Harly in August the female 
gives birth to about eight young ones. Ants appear to form their principal 
food, though they are not by any means limited to them, They are vul- 
garly called “Horned Toads.” The subfamily Anoliide is represented in 
the Southern States by a common Saurian, the little greenish, flat-crowned, 
slender-tailed, goitred lizard of the trees and bushes, sometimes called 
“Chamaeleon” or “Scorpion.” 
The Lacertide belong to the old world. They are diurnal land lizards, 
with polygonal symmetrically-arranged shields on the head, slender, forked 
exsertile tongues, eyes provided with lids, nonimbricate scales, four limbs, 
and long fragile tails. They are the common lizards of Europe. The 
genus Zootoca is viviparous. 
The Tetid@ are Saurians of the Western Hemisphere. Their heads are 
covered with angular shields; and their tongues are free, notched, and 
exsertile. The only genus representing the family in the United States 
contains the slender, short-limbed, six-lined lizard Cnemidophorus sealineatus, 
of the South. Species of this genus are more numerous in the Rocky 
Mountain district, from Montana to Mexico. - Tews contains several large 
South American species; they are the “Tupinambis” of the Amazon basin, 
A young individual has the teeth fixed on the inside of the jaw bone, but 
as he grows older the bone surrounds them more and more. 
The Scines, Scincide, generally have fusiform or subcylindrical bodies, 
and are covered with glossy scales, which are either smooth, keeled, or 
erooved. The limbs are short, the body and tail rather long. In some 
there are no limbs, Anguis; in others there are two, Ophiodes; and in the 
