N. ClJNLIFFE 
209 
3. the posterior island tends to break up into three elongated 
patches, following the dorsal furrows. 
It should be noted that the variation of the ornamentation is not 
dependent on the size of the scutum, the figured specimens all being 
drawn to the same scale. 
Projection of Coxa I. 
Normally the anterior projection of coxa I beyond the scutum is 
easily visible from the dorsal side and it bears a distinct ridge. In the 
larger well-developed forms this ridge tends to become much stronger 
and to a slight extent retrograde, whereas in the dwarf males, although 
the coxal projection is still fairly prominent, the ridge is much reduced 
and in the smallest individuals (Fig. 4) is hardly apparent at all. 
Shape of Basis Capituli. 
There is a regular gradation in the size of the basis capituli, with 
practically no structural variation. The lateral angles are always 
rounded and distinctly anterior and the cornua strong and blunt. 
There are generally four small circular depressions arranged in the 
transverse median line, but the number varies from two to six. A 
number of hairs passing dorso-ventrally over the lateral angles, in a 
manner characteristic of Rhipicephalus, are present in all specimens. 
Palps. 
In the typical individual, articles II and III of the palps are notably 
concave dorsally; this concavity is very pronounced in the large speci¬ 
mens, but in the smallest forms it is absent, and its presence in the 
type is indicated only by a very indefinite ridge, the dorsal surface 
of the palp being flat or even slightly convex (Fig. 4). 
Cervical Grooves. 
These are deep oval pits, equally well defined in all specimens but 
one, which seems to be imperfectly formed in other respects. 
Punctation. 
Towards the “dwarf” end of the series the few medium-sized 
punctations, situated chiefly on the white field, towards the scapulae, 
become very small, shallow and not readily discernible, those which 
indicate the obsolete lateral grooves being modified in a similar fashion. 
