CLASS III. REPTILIA: OllDEE 3. SAURIA. 375 
THE GLASS-SNAKE. 
inches long ; color bluish-black ; feeds on insects ; is often found under the bark of trees, and is 
perfectly harmless. It is met with from Massachusetts to New York. 
Genus CELESTUS : Celestus, includes the Galliwasp, C. occiduus^ of the "West Indies, a 
small, harmless lizard, though an object of dread to the inhabitants. 
Genus PLESTIODON : Flestiodon. — To this belongs the F. eryihroceplialus^ which lives in 
holes of trees, often at a height of thirty or forty feet from the ground, where it frequently takes 
possession of the deserted nest of a woodpecker. When disturbed, the lizard puts out his head, 
Avhich is very large and of a bright red color, in a most threatening manner ; and when cap- 
tured, its powerful jaws and strong teeth enable it to inflict a severe wound, although it is 
not venomous, as commonly supposed. Found in the Southern United States. There are sev- 
eral other species in the Middle, Western, and Southern States. 
Genus TROPIDOLEPIS : Tropidoleiois. — This includes the Brown Swift, T. undulatus, five 
to eight inches long; brown above, beneath green. It is very agile, perfectly harmless, lives in 
woods, and feeds on insects. It is sometimes called the Pine-Lizard^ and also the Broion Scorpion. 
Found in the Southern States. 
THE CHALCID^. 
This family derives its name from a Greek town, Ohalkis. The same variety of limbs belong 
to it as to the preceding. Instead of the imbricated, bony scales of the skinks, however, these 
have the common reptilian scales, arranged in regular transverse rows. The eyelids are always 
present, the ears exposed, the tongue short, fleshy, and notched at the tip. Species are found in 
Asia, Africa, Europe, and South America. 
Genus PSEUDOPUS : Pseudopus. — ^This includes the Scheltopusik, P. PaUasii, which has 
two rudimentary hind-legs ; found in Southeastern Europe. 
Genus CHAM^ESAURA : Chamcesaura. — To this belongs the Anguine Lizard, C. anguina 
— Lacerta anguina of Linnasus, and made the type of a distinct family by Dr. J. E. Gray. The 
body is covered with elongated, keeled scales, in longitudinal series. The feet are four in num- 
ber, exceedingly small, with a single toe to each. It is found at the Cape of Good Hope. 
THE LACEETIDJ5. 
Tliese have the body clothed with scales, and the head with large, regular plates ; the head is 
distinctly separated from the neck, which is never furnished with a pouch under the throat, or 
with any other appendages ; the eyes are provided with a pair of movable eyelids, and also 
