(jr. H. F. Nuttall, W. F. Cooper and L. E. Robinson 177 
that of the female; it consists of a large triangular process, the shape 
and disposition of which are seen by reference to the figure (Pis. XIV, 
Fig. 4 and XV, Figs. 5, 6). 
III. The Capitulum of the Nymph. 
(PL XIV, Figs. 5 and 6.) 
The capitulum of the nymph is intermediate in its general appear¬ 
ance between that of the adult and the larva. The salient ridges, seen 
in the adult on the basis capituli, are fairly well-developed: the anterior 
portion of the basis capituli is wider in front than behind, and its dorsal 
surface is produced laterally into large triangular flattened processes 
with rounded extremities: the postero-lateral angles of the ventral ridge 
are produced into short rounded backwardly directed processes, which 
for descriptive purposes we have styled “ cornua.” As in the adult, the 
basis capituli shows a posterior neck-like constriction immediately 
behind the dorsal and ventral ridges. 
The hypostome is less spatulate and is provided on its ventral surface 
with four rows of denticles, about nine to each row. 
The chelicerae of the nymph appear to be similar in all respects to 
those of the female. 
The palps differ from those of the adult tick. Four articles can be 
distinguished, but the second and third articles are more or less fused 
with one another. The first article is very small; is completely concealed 
within the basis capituli and less readily distinguished than in the adult. 
The second article is large, and is raised on its ventral, lateral, and 
dorsal surfaces as a prominent rounded ridge, which forms the pronounced 
external angle of the palp. The infra-internal margin of this article 
bears five hairs, flattened and feather-like as in the adult, but wider at 
their bases and more tapering at their extremities. The third article is 
conical and forms the extremity of the palp; it is almost completely 
fused with the second article, the only line of demarcation being found 
towards the internal margin of the dorsal surface, where a deep indenta¬ 
tion in the contour of the edge indicates the commencement of a fissure 
which is produced round the palp on its dorsal side for a short distance 
only. A shallow depression runs round the lateral surface of the article, 
and this, together with the arrangement of the hairs on its proximal side, 
shows the line of fusion with the second article. The infra-internal margin 
of the third article carries a single feather-like hair. The fourth article is 
