18GI.] DR. A. GUNTHER ON BRAZILIAN REPTILES. 17 



the snout is as broad as long. The whole of the upper surface is 

 covered with small, irregular shields, that in the middle of the occi- 

 put being the largest, about as large as the eye. The superciliary 

 margin is sharply prominent, continued into the canthus rostralis, 

 and formed by imbricate pointed scales, the point of which is directed 

 backwards. The eyelids are entirely covered with small granular 

 scales. The nostril is situated near the extremity of the snout, before 

 the canthus rostralis, and separated from it by a shallow groove ; it 

 is in a single convex shield. The upper and lower labial shields are 

 narrow, and there are two or three other series of small shields, run- 

 ning above, and parallel to, the upper labials, and covering the loreal 

 region. The lower of those series extends to below the eye. The 

 neck and the temporal region are covered with small keeled scales. 

 The opening of the ear is large, subtriangular, and its anterior mar- 

 gin is provided with six or seven tooth-like plates. The scales on 

 the lower side of the head are small, smooth, and become smaller on 

 the^ throat, where they form a very indistinct collar. There are two 

 obhque, deep folds on the side of the neck, between tympanum and 

 shoulder. 



The back is covered with keeled scales of moderate size, the keels 

 terminating in small spines, and forming lines which converge from 

 both sides towards the vertebral line. There are seventeen longitu- 

 dinal lines of keels across the back between the shoulder-joints and 

 fifteen between the hip-joints. The scales on the upper parts of the 

 limbs are more sharply keeled and more spiny than those on the 

 back. The tail is of moderate length, depressed on its base, and 

 slightly compressed on its middle ; it is surrounded by rings of scales, 

 which are much larger than those of the body, each terminating in a 

 prominent spine. 



The scales on the belly are rather small and smooth, disposed in 

 transverse series ; there are about twenty longitudinal series across 

 the breast between the front limbs ; the scales on the lower parts of 

 the limbs are smooth, except those on the soles of the feet and toes, 

 which again are strongly keeled. There are no femoral or anal pores. 

 Palatine teeth none. 



All the upper parts are brownish-olive ; the lower dull yellowish, 

 with indistinct greyish reticulated lines ; the region before the vent 

 is deep brown, and a band of the same colour runs along the lower 

 side of the thigh. 



in. lin. 

 Length of the snout (to the anterior angle of the 



orbit) 4 



Length of the head (to the antei'ior margin of the 



tympanum) iO 



Greatest width of the head 8|- 



Distance of the anterior angles of the orbits .... 4^ 

 Length of the trunk (from tympanum to vent) . . 2 G 



of the tail 5 



of the fore limb 1 9 



of the hind limb 2 6 



Proc. Zool. Soc— 1861, No. II. 



