202 REPTILIA: LACERTILIA. — XXIX. 
extensible and retractile into a sheath formed by a transverse fold 
at anterior extremity of posterior part, this sheath disappearing 
when the tongue is drawn out. Premaxillary single; dermal cranial 
ossifications roofing over the temporal fossa; clavicle slender; limbs 
present or absent, the shoulder girdle and pelvis always present; 
no abdominal ribs; bony plates underlying the scales ; vertical plate 
on head present. Genera 7; species 45; in warm regions. 
a, Side with a conspicuous fold; limbs wanting or the hinder rudimentary; 
body snake-like, the tail very brittle ; scales squarish rhomboidal, form- 
ing straight series, in either direction. . . . . . OpHisAuRrus, 296. 
296. OPHISAURUS Daudin. (8s, snake; caipos, lizard.) 
589. O. ventralis (L.). Guass Snake. Jornt-SNAKE. Green- 
ish or brownish; sides largely yellow, with narrow black streaks. 
Dorsal scales in 14 rows or 120 transverse series; 10 rows on belly ; 
scales on back obtusely keeled, others smooth; ear much larger than 
nostril. L. 25. Wis. to Kan. and S. 
Famiry CXVIL IGUANIDAS. (Tue Icuanas.) 
Tongue thick, villous, nearly or quite entirely fixed to the floor 
of the mouth, and little if at all notched in front; pupil round; eye- 
lids well developed; scales various, those on head usually small ; 
head generally with an enlarged interparietal scale; teeth subequal. 
Habits various, mostly insectivorous. A very large family of 50 
genera and 320 species, swarming in the hotter parts of America; 
a very few in the East Indies. 
a. Femoral pores absent; toes dilated or depressed, the distal joint narrower, 
cylindrical or compressed, raised above the one before it; scales small 
or granular; # with an inflatable gular sac; tail long, not prehensile ; 
lateral teeth tricuspid; no sternal fontanelle; tympanum distinct. 
ANOLIS, 297. 
aa. Femoral pores present; fourth toe longer than third; lateral teeth tri- 
cuspid, 
b, Head without spines; no dorsal crest; occipital scale very large. 
¢. Gular folds 2, the second denticulated; dorsal scales minute, uniform; 
caudal scales small; tympanum concealed.. . Honprooxra, 298. 
ec. Gular folds none; tympanum distinct; scales keeled, equal; no crest. 
SceLoporus, 299. 
6b. Head armed with bony spines; body short, depressed; a large sternal 
fontanelle; scales unequal. . . . - . » Purrynosoma, 300. 
297. ANOLIS Daudin. 
590. A. principalis (L.). “CHaMa&LEon.” Grass-green; head 
brownish, the color changing at times in life to grayish, yellowish, 
bronze, and black; gular sac crimson when inflated; head scales 
large and rough; scales of body subequal, keeled. L. 6. Pine 
woods, Tenn. to Cuba; common S.; one of the most beautiful of 
lizards. (A. carolinensis Cuvier.) 
