394 
Messrs Nuttall and Warburton, 
given in a footnote some measurements relating to the digit, spiracle, etc. 
We have thought it advisable to note any differences of coloration observable 
in the specimens when dry or when immersed in alcohol. 
The figures are in most instances reduced from drawings made with 
the aid of the camera lucida from specimens mounted in balsam, any errors of 
interpretation due to the transparency of the chitin being corrected by 
reference to the opaque object. The digits are all of the right side, viewed 
dorsally, the spiracles appear as viewed from the left side, the tick being held 
horizontally (when gorged) or rotated on its long axis sufficiently to bring all 
parts of the spiracle into focus. 
Ixodes cavipalpus n. sp. 
Figures 1 — 5. 
Male, L. T9, W. 42 mm. Body long oval (Fig. 1). Scutum 
accurately long oval, broadest in the middle, glossy, hairless, not 
covering the whole dorsum but leaving a marginal fold which is 
very narrow in front and gradually broadens posteriorly ; no lateral 
grooves; cervical grooves* and punctations very faint. Venter 
brown with long hairs ; sexual orifice between coxae III; pregenital 
plate longer than broad, narrow in front; anal grooves slightly 
divergent ; adanal plates slightly broader in front ; spiracles oval, 
white. Capitidum (Fig. 2) short ('5 mm.) like that of lx. ricinus 
in general appearance ; basis capituli with median posterior point 
ventrally; hypostome with six well-marked transverse ridges of 
teeth giving the effect of dentition 3|3. Legs moderately strong ; 
coxa I with a slight spur, coxae II — IV unarmed ; tarsi tapering 
gradually. 
Fig. 1. <? dorsal aspect. Fig. 2. s capitulum, A dorsal and B ventral aspects. 
(The teeth on the hypostome in A are visible by transparency.) 
Accentuated in Fig. 1. 
