405 



The single anterior labial of the lower jaw is slightly convex, as 

 long as wide ; there are five narrow shields along the side of the lip, 

 the third being the longest. There is a single pentagonal chin-shield 

 between the first two labials, forming a straight transverse suture 

 with the front labial. Two series of shields arise from its two pos- 

 terior sides, parallel to, and broader than, the series of the lower 

 labials ; each is formed by four shields. The throat, before the col- 

 lar, is covered with granular scales ; the collar itself is formed by a 

 fold, before which are some keeled scales of moderate size. 



The tympanum is round, of moderate extent, and not surrounded 

 by any particular scales. 



The scales of the back are exceedingly small, smooth, imbricate, 

 those of the sides finely granular ; the ventral shields are quadran- 

 gular, keeled, and form eleven longitudinal and thirty- one transverse 

 series. The space before the vent also is shielded. The scales of the 

 tail, which is rounded, are of moderate size, oblong, keeled, verti- 

 cillated, each verticillus being formed by a single ring of scales. 



The fore-leg reaches to the extremity of the snout, if laid forwards. 

 The third and fourth fingers are equal in length, theia follow the 

 fifth, the second, and the first ; its anterior side and the fingers are 

 covered with imbricate scales, those of the upper and fore-arm being 

 keeled. The hind-leg reaches to the anterior margin of the orbit, 

 if laid forwards. The toes have the usual relative length of this 

 family. The interior side of the limb and the upper parts of the 

 foot are similarly scaled as the fore-leg. There are no femoral pores. 

 The ground colour is greenish-blue ; a greenish-white streak runs 

 from the tip of the snout to the middle of the back, where it is gra- 

 dually lost. A black serrated band on each side of the vertebral 

 streak extends froip the nostril to the loin, emitting cross-streaks to 

 its fellow ; the anterior part of the tail also exhibits several irregular 

 black cross-streaks. 



A single specimen is in the collection. 



inches, lines. 

 Distance between the extremity of the snout and 



the tympanum 7 



Distance between the tympanum and the vent . . 1 7 



Length of the tail 4 



Distance between the extremity of the snout and 



the anterior margin of the orbit 3 



Distance between the anterior angles of the orbits 2f 



Length of the anterior extremity 10 



of the third finger 3^ 



of the posterior extremity 1 7 



of the foot 10 



■ of the fourth toe 7\ 



5. Cercosaurus gaudichaudi {Ecpleopus gaudichaudi, Dum. 

 and Bibr.), Gray, Catal. p. 60. 



6. Cercosaurus rhomjbifer, n. sp. (PI. XX. fig. A.) 

 De«</wo««*. — Scales smooth, in fifty cross series between the occi- 



