N. CUNLIFFE 
211 
The lateral grooves may be, however, sometimes represented by only 
three or four punctations, or by a linear series of many deep punctations. 
Dorsal Furrows. 
Independently of the size of the scutum, there is a considerable 
variation ; in one of the smaller individuals the furrows are deep for the 
size of the tick and the two lateral furrows equal the median one in 
length, this extending beyond the anterior margin of the posterior 
island. In the majority of forms, however, the lateral furrows vary in 
length from a half to two-thirds that of the median furrow and from 
scarcely observable oval depressions to narrow elongated but still ill- 
defined furrows. 
Hypostome. 
The number of files and approximately the number of denticles on 
each file is constant throughout the series, but the denticles on the 
hypostome of the dwarf male are relatively small, not overlapping to the 
extent observed in the larger forms (Fig. 4), the files being more clearly 
separate from one another. 
Anal Plates, etc. 
Here the extreme differences in form will be best appreciated from 
the figured specimens (Fig. 4), although it may be pointed out that the 
plate in the larger forms develops an outer angle posteriorly; that 
in the dwarfs the degree of chitinisation, and hence the visibility, 
of the plates is but slightly more than that of the general body surface ; 
and finally that the punctation of the plates of the dwarf forms is rather 
more pronounced than that on the scuta. 
There are no accessory plates in this species. 
There remain to be considered a few minor points. The legs of the 
dwarfs have not the pronounced “beady” appearance of those of the 
typical specimen, but the relative proportions of the false articles of 
the fourth tarsus are almost constant. 
The “ foveae ” and the minute dark punctations which cover the 
whole scutum appear to be similarly developed in all specimens. The 
hairiness of the general body surface is relatively constant, although not 
obviously so, owing to the fact that the hairs of the larger forms are 
frequently broken off, leaving stumps visible only under considerable 
magnification and conveying to the hasty observer the impression of a 
