Key to Species 135 



distinguished were originally stated to be : the convex inner surface of the 

 palp, and the pointed extremity of the third palpal article in the <$ ; the 

 slightly hollow internal surface and swollen ends of the palps in the $ ; anal 

 grooves of <J as in Ixodes, but absent in the $ ; anal and adanal shields 

 in the $. Neumann, 1904, p. 444, subsequently recognized that the ? (/. 

 putus q.v.) differed so slightly from other "J Ixodes, that the genus could not 

 be retained ; the was found to possess an anal groove and the $ only differs 

 from other £ Ixodes in respect to its palps. He therefore degraded Ceratixodes 

 to a subgenus. Still retained as a genus by Blanchard, 1909, p. 97. 

 Euixodes Neumann, 1904, p. 444. A subgenus founded to include all Ixodes other 

 than Ceratixodes and Eschatocephcdus (the latter genera reduced to subgenera). 

 Since we see no reason for retaining the latter subgenera, Euixodes falls into 

 the synonymy of Ixodes. 



Generic Characters. Anal grooves embracing the anus anteriorly, 

 and usually uniting in a pointed arch or the arc of a circle. Scutum 

 always inornate, and without eyes. No festoons. Spiracles round or 

 oval. Tarsi without spurs {except in Ixodes putus). The male scutum 

 is always surrounded by a prominent marginal body-fold, and the male 

 venter presents seven non-salient chitinous plates, namely, a pregenital, 

 a median, an anal, two adanal and two epimeral plates. The genital 

 aperture is comparatively posterior in both sexes, and in the distended 

 female the legs occupy a very anterior position. There is marked sexual 

 dimorphism as regards the hypostome. Figs. 115-119. 



N.B. In most species the second article of the palp is narrowed at 

 the base, leaving a space between it and the hypostome, and this gives 

 the ticks a peculiar facies easily recognized by the naked eye. There 

 are, however, exceptions. 



Type species : Ixodes ricinus (Linnaeus) Latreille, 1804. 



Key for the determination of species of Ixodes. 

 Males. 



There are 21 species of males recorded of which one (pratti, p. 174) 

 has not been adequately described. 



^ ' PAGE 



(Body with 5 posterior brushes of hairs . . . putus 256 



\ „ without such hairs 1 



(Legs inordinately long. ..... vespertilionis 272 



( „ moderately , .2 



(Basis capituli with dorsal punctate excavation . coxaefurcatus 270 

 1 „ M without „ „ .3 



