226 = Prof. J. V. Barboza du Bocage on two 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 praanal 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. 
Hatitat.—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 through M. d’Anchieta. 
