210 



Genus Ixodes 



foveolate on each side." Johnston's specimens were taken from the 

 pointer, and were sent to him as "the dog-tick." Neumann (1906), in 

 correspondence with Mr Evans, doubtfully refers to canisuga as possibly 

 synonymous with hexagonus var. inchoatus. Judging from the numerous 

 specimens which have reached us from Scotland, England and Ireland, 

 canisuga appears to be pre-eminently " the dog-tick " of this country 

 and we have no doubt, despite his insufficient description, that Johnston 

 had this species in view. Banks (1908, p. 32) appears to have come to 

 the same conclusion. 



Male (Figs. 202-205): Broad oval. Scutum: 1-9 x 11 to 23 x 

 l - 5 mm., oval, only slightly narrower in front, marginal fold fairly 

 broad ; very finely punctate, cervical grooves chiefly visible as elongate 

 divergent depressions, far from the anterior border; lateral grooves 

 absent; two other elongate, parallel depressions on either side of the 

 middle of the scutum. Emargination moderate ; scapular angles blunt 

 and rather rugose. Venter : genital orifice facing the second intercoxal 

 space, pregenital plate ill-defined ; median plate fairly broad, widest 

 just behind the spiracles; anal plate with sides only slightly divergent; 

 adanal plates long, with sides nearly parallel. Spiracle nearly circular. 

 Capitulum: very small; base rectangular, broader than long dorsally, 

 the posterior border slightly concave; no cornua; a slight median ridge 

 or prominence. Palps very short, convex dorsally, article 2 barely 

 longer than article 3. Hypostome (Fig. 204) bifid, with about eight 



Fig. 202. I. canisuga g : dorsum and venter, x 20. The slight protuberances at the 

 postero-lateral angles of coxae II-IV omitted through an oversight. Specimen 

 collected in Northumberland, 1905, by E. G. Wheler. (N. 1079 ex W. F. Cooper coll. 

 Original, G. H. F. N. del.) 



