590 MEDICAL ENTOMOLOGY 



of a small shield situated behind the capital um. Porose areas present on 

 the dorsum of the capitiilum of females ; eyes if present situated at sides 

 of anterior end of scutum. (Neumann) 



Neumann divides the Ixodini into three tribes as follows I- 

 Male with several non-salient ventral shields . . Tribe Ixodaria. 

 Male with two adanal shields ..... Tribe Rhipicephalaria. 

 Male without ventral shields or plates, but with plaques 



(Donitz) ........ Tribe Amblyommataria. 



TRIBE IXODARIA 



Anal groove surrounds anus anteriorly; it may be open or closed pos- 

 teriorly and is not connected with the genital groove. Capitiilum elongat- 

 ed. Eyes absent. Posterior festoons wanting. Spiracle circular or oval. 

 Male with ventral shields as follows : one anterior to the genital 

 orifice, the pregenital, a second, the median, between the genital and 

 anal openings, a third, the anal, on which the anus is situated; an 

 epimeral plate lying laterally, on which the coxae and spiracles are 

 situated ; one adanal plate situated at each side of the anal. (Neumann) 



The ticks belonging to this tribe are very characteristic ; they are all of 

 a brown colour, and their dorsal shields are without any ornamentation. 

 Except for one species, Ceratixodes putus, Cambridge, their tarsi are 

 without spurs. The second palpal segment is nearly always narrowed, 

 thus leaving a space between it and the hypostome ; this character gives 

 the ticks a striking appearance. 



Neumann divides the Ixodaria into one genus Ixodes, and three sub- 

 genera Ixodes, Ceratixodes and Eschatocephalus. The characters of 

 the genus Ixodes are those of the tribe Ixodaria ; he gives the following 

 key to the subgenera. 



NEUMANN'S KEY TO THE SUBGENERA OF IXODES 



1. Palps hollowed out on their internal surfaces in both sexes . Ixodes. 



Palps convex on their internal surfaces in the male . ... . 2 



2. Third article of the palps of the male terminating in a point 



at its distal extremity . . . . .' ' . . Ceratixodes. 

 Third article of the palps of the male thickened at its extremity Eschatocephalus. 



SUB-GENUS IXODES (LATR.), NEUMANN 



Second and third segments of the palps in both sexes hollowed out on 

 their internal surfaces ; the palps are shorter in the male than in the 

 female. Tarsi without terminal spurs. (Neumann) 



