5. 



7. 



(dr. a. c. oudkmans). notes on acari. 97 



With menlum III. Dermanyssinae. 



Without mentuni IV. Splniurnicinae. 



6. Only one subfamily .... V. Caelenopsinae. 



c? genital aperture close to the 



ant. -edge of the sternal shield VI, Rhodocarinae. 

 i genital aperture between coxae 



3 and 4 8 



$ genital opening behind the ster- 

 nal shield 9 



? genital opening in the sternal 

 shield 12 



<? and 5 chelae without appendage 10 

 (^ and ? chelae with appendage 11 



Î sternal shield single . . . VII. Eplcrïhiae. 

 \ ? sternal shield double, a left 

 ' and a right one Vili, lîeterozerconiuae. 



11. Only one family IX. Aidemiophorinae. 



Stigma above coxa 3 ; palps 



distally thickened .... X. Rolotliyrinae. 



Stigma between coxa 3 and 2; 



palps usual .■ XI. Uropodinae. 



12 



Classification of the Ixodldae. I cannot agree with that given by 

 Mr. G. Neumann. (Mém. Soc. Zool. Fr. 1901, p 323), in so far 

 as this author does not seem to rely upon the probable relative 

 ancienty of the subfamilies As to me, the Argasinae must be called 

 first, as they ai'e the less modified descendants from their probable 

 progenitors. Their palps are usual, cylindric. Tiien follow the 

 Ixodiiiae with sheathsliaped palps (except the Ì oi Escliatocephalus). 

 The tribus of the Ixodiuae are called Ixodae and lihipicephalae. 

 The former are apparently older, moìnàm^^ EscJiaiocephaIus,i\\e$ oî 

 which have usual palps; whilst the latter with their marvellous 

 difformed palps are of younger date. 



Classification of the Spelaeorhynchidae. Contains one species. 



