20. noPLUUUs. — 21. stenockrctts. 131 



3. Hoplnrus quadrimaculatiis. 



Opluvus quadriniaciilalus, A. Dion. Cat. Mcth. licpf. p. 83. 

 (_'t'iitiu]-a quadi'imaculata, A. Duin. Arch. Mus. viii. p. o'j^, pi. xxii. 



fig. 4. 

 POplurus montanus, Grandid. licv. 8^- Mac/. Zool. (2) xxi. 18^0, 



p. .'540. 

 Ilopliirus quadrimaciilatus, Peters, JReise w. Mossaiiib. iii. p. .31. 



Upper head-scales small, smooth ; occipital slightly enlarged ; 

 anterior border of ear denticulated, j^o nuchal crest. Dorsal scales 

 very small, granular, flat, smooth, smaller thau ventrals ; latter 

 small, suhimbricate, smooth ; gular scales granular. Body and base 

 of tail much depressed. Scales on the limbs keeled and much larger 

 than those on the body. Tail about once and two thirds as long as 

 head and body, with whorls of rather small, spinose, keeled scales, 

 the size of which equals hardly twice that of the tibials. Dark 

 olive-brown, with small round lighter spots and transverse series of 

 irregular roundish black spots, which are however sometimes re- 

 duced to one pair on each side behind the shoulder ; a series of more 

 or less confluent light spots on each side of the back ; throat and 

 breast grey, or marbled with grey ; belly and lower surface of 

 thighs whitish. 



Total leugth 350 millim. 



Head 30 „ 



Width of head 24 „ 



Body 100 „ 



Fore limb 52 ,, 



Hind limb 98 „ 



Tail 220 



Madagascar 



<) 



to" 



a. Ad. Madagascar. Col. Lyoll [C]. Zool. Soc. 



b-e,f-g. Ad., hgr., & yg. E. Betsileo. Rev. D. Cowau [C.]. 



21. STENOCERCUS. 



Stenocercus, Diim. ^- Bihr. iv. p. S^jO ; Fitzing. Si/st. Rept. p. 71 ; 



Gray, Cat. Liz. p. 219. 

 Tracbycyclus, Dum. S,- Bibr. I. c. p. 855 ; Fifzhn/. 1. c. ; Gray, I. c. 

 Micropliractus, Gi'udher, Proc. Zool. 8oc. 1859, p. 90. 



Tympanum distinct. Body subcylindrical or depressed ; dorsal 

 crest absent, or represented by a slightly serrated ridge ; dorsal 

 scales more or less imbricate. Upper head-scales small, smooth. 

 A curved fold in front of each shouhler, not extending across the 

 throat. Digits compressed, with keeled lamelkc interiorly. No 

 femoral or anal pores. Tail su])cylindrical or compressed, with 

 whorls of strongly keeled or spinose scales. Lateral teeth tricuspid : 

 pterygoid teeth present or absent. A large sternal fontanelle. No 

 abdominal ribs. 



Western South America. 



k2 



