226 Prof. J. V. Barboza du Bocage on tivo new Saurians 



eighth labials. Anterior margin of the ear furnished with three 

 denticulations. Upper parts and sides of the neck, and the 

 anterior half of the back clothed with very small rounded scales, 

 smooth and not imbricated ; on the posterior half of the back 

 and on the base of the tail these scales gradually become larger 

 and more distinctly keeled and imbricated ; the rest of the tail 

 is covered with large keeled scales above and below. Ventral 

 shields quadrilateral, smooth, arranged in longitudinal and 

 transverse series ; the widest of the latter includes eighteen 

 shields. In the middle of the praianal region there is a large 

 scale surrounded by smaller ones. Femoral pores twenty to 

 twenty-two. Digits smooth beneath, but denticulated on the 

 edges ; the anterior less compressed than the posterior. 



Coloration. — Above (on a ground sometimes fulvous, some- 

 times with a bluish tinge) all our specimens present a reticulate 

 design of a dark-brown colour. On the head predominates an 

 olive tint punctured or marbled with brown. A blackish streak, 

 more or less interrupted, follows the middle of the dorsal sur- 

 face of the tail ; another similar streak extends along each side 

 of the tail, from its origin to its extremity. The upper surface 

 of the limbs resembles the back. The inferior regions are 

 white or yellowish white. 



Dimensions. — The largest of our individuals measures 150 

 millims. in length, of which the head occupies 14, the trunk 37, 

 and the tail 99. 



Habitat. — Mossamedes, Western Africa. The natives call it 

 Cocola, a name which they also give to several other Saurians. 

 The five individuals which we possess were sent to us by our 

 indefatigable travelling naturalist, M. d^Anchieta. 



In its characters this reptile seems to approach most closely 

 to the genus Scapateira. Thus the position of the nostrils in 

 the midst of three shields, the existence of numerous femoral 

 pores, the structure of the dorsal scales and ventral shields, the 

 denticulations with which the edges of the digits are furnished, 

 and the presence of an antepectoral fold are so many characters 

 which it has in common with the single species of that genus, 

 Scapateira grammica. Nevertheless it presents certain differences 

 of some importance, such as the absence of an occipital shield, 

 and especially the conformation of the anterior digits, which 

 have no well-marked flattening. This is why we hesitate in 

 referring it to the genus Scapateira. 



Pachyrhyncus, genus novum. 



This new genus that we propose is established upon the 

 examination of a single adult individual lately received from 

 Mossamedes throu'rh M. d'Anchieta. 



