3. CENTROPYX. 341 



above and beneath by a broad black band or a series of black spots ; 

 a second, more or less distinct, light lateral line, beginning from the 

 ear ; lower surfaces greenish white. 



milliin. millira. 



Total length 344 Fore limb 37 



Head 24 Hind limb 68 



Width of head .... 15 Tail 245 



Body 75 



Guianas, Brazil. 



a 



2 . Demerara. 



b. 9 , British triiiuna. 



c,d. 2 . S. America. T. Bell Esq. [P.]. 



e-h, i, k. 2 ^ ^o^' S. America. 



The fact that all the specimens examined by various authors as 

 well as by myself are females, makes it possible that C. intermedms 

 is the female of C. striatas, as already suggested by Troschel. How- 

 ever, this is by no means certain, and the characters which separate 

 the two forms are not of a kind known to vary according to sexes iu 

 other genera of lizards. 



B^ 



3. Centropyx calcaratus. 

 Kentropyx calcaratus, (S^pu', 6};ec. nov. Lacert. Bras. p. 21, pi. xxii. 



Lacerta striata {non Dand.), Wied, Abbild. 



Trachypaster calcaratus, JVagl. Si/st. Amph. p. 154. 



Teius (^Centropyx) calcaratus, Gray, Griff. A. K. ix. Sijn. p. 31. 



Centropyx vittatus, Wieym. Herp. Mex. p. 26. 



calcaratus, Dum. 8,- Bibr. v. p. 149 ; Cope, Proc. Ac. Philad. 



1861, p. 495 ; Peters, Mon. Berl. Ac. 1869, p. 64, and 1877, p. 412. 



Interorbital and occipital region concave in full-grown specimens, 

 boi-dered by a prominent ridge, Gular scales small, subhexagonal, 

 keeled, juxtaposed or slightly imbricate, slightly enlarged on the 

 middle of the throat ; the edge of the collar not, or but very slightly, 

 denticulated ; the last row of mesoptychial plates composed of fifteen 

 or sixteen plates, sometimes even separated from the fold by gi'auules. 

 Median dorsal scales only a little enlarged, subhexagonal, juxtaposed, 

 keeled ; scales on the Hanks very small, almost granular. Median 

 temporal scales minute. Ventral plates in fourteen or sixteen longi- 

 tudinal and thirty-three to thirty-five transverse series. Pra^anal 

 scales smooth in the males, strongly keeled in the females ; tlio former 

 with two large pi"aeanal spines on each side. Inferior femoral scales 

 very small, those of the lower series hardly as large as the median 

 gulars. Femoral pores seventeen to nineteen. Olive above ; a 

 light line on each side of the body, commencing from the eye, 

 bordered inferiorly, and sometimes also superiorly, by a row of black 

 fipots, which may be confluent into a band; females with a broad 

 median yellowish band on the head, which is generally lost on the 



