202 KEITILIA : LACEUTILIA.. — XXIX. 



cxtonsible and rrtractilf into a slicath formed ])y a transverse fold 

 at anterior extremity of j)osterior part, this sheath disapju-arinj^ 

 when the tongue is drawn out. I'remaxiUary sinj^K- ; dermal cranial 

 ossilieations roofin;; over the temjioral fossa; elaviele slender; limbs 

 present or absent, the shoulder <;irdle and pelvis always present; 

 no abdominal ribs; bony plates underlyinj^ the scales; vertical plate 

 on head jiresent. Genera 7 ; species 45 ; in warm retjions. 



a. Side with a conspicuous fold; limbs wanting or the hinder nidimcntary; 

 body siiaki'-likf, the tail very brittle ; scales Squarish riionibdidul, furin- 

 inf,' slraiu'lit M-rics, in either direction UriiisAi'Kis, '2'J6. 



296. OPHISAURUS Daudin. (o0»r, snake ; aavpos, lizard.) 



689. O. ventralis (L.). Glass Sxake. Joixt-Sxakk. Green- 

 ish or brownish ; sides largely yellow, with narrow black streaks. 

 Dorsal scales in 14 rows or 120 transverse series ; 10 jpws on Ixdly ; 

 scales on back obtusely keeled, others smooth ; ear much larger than 

 nostril. L. 25. Wis. to Kan. and S. 



Famii^y CXVI. IGUANID^. (Tiik Toitaxas.) 



Tongue thick, villous, nearly or (juite entirely fixed to the floor 

 of tlu' mouth, and little if at all notched in front; pu]iil round; eye- 

 lids well developed; scales various, those on head usually small ; 

 heail generally with an enlarged interparietal scale; teeth sid)e(pial. 

 Habits various, mostly insectivorous. A very large family of 50 

 genera and 320 species, swarming in the hotter j)arts 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 aliovc the one before it ; scales small 

 or granular ; cf with an inflatable gular sac; tail long, not iirehensile ; 

 lateral teeth tricuspid; no sternal funtanelle ; tympanum distinct. 



A.Noi.is, 207. 

 aa. Femoral pores present ; fourth toe longer than third ; lateral teeth tri- 

 cuspid. 

 6. Head without spines ; no dorsal crest: occipital scale very large. 



c. Giilar folds 2, the second denticulated; dorsal .scales minute, imiform; 



cau<lal scales small; tympanum concealed. . . Holiirookia, 208. 



cc. Gular folds none; tympanum distinct; scales keeled, e<|ual; ni> crest. 



8cKi,oroKt'.s 299. 



bf). Head armed with bony spines; body short, depressed; a large sternal 



fontanelle; scales uneiiual I'micvnosoma, 300. 



297. ANOLIS Dau.Hn. 

 50O. A. principalis (L.). " ('iiAM^n.Kox." Grass-green ; head 

 brownish, the color changing at times in life to grayish, yellowish, 

 bronze, and black ; gular .s.ac crimson when inflated ; hea<l scales 

 large and rough; scales of liody subcqiial, keeli-d. L. C. Pine 

 wootls, Tenn. to Cuba ; common S. ; one of the most l>eautiful of 

 lizards. (.1. rnrolineusis Cuvier.) 



