96 



/ 



(dr. a. c. ottdemans). notrs on ACAHr. 

 I. Mesostigmata. 



Acari. ( 



n. Prostigmata. 



Ill . 



IV 



V 



VI 



1. Parasitidae. 



2. Ixodidae. 



3. Spelaeorhynchidae. 



4. Thrombidiidae, 



5. Tarsonemidae. 



6. Hydrarachnidae. 



7. Halacaridae. 



8. Nicoletiellidae 



9. Oribatidae. 



10. Acaridae. 



11. Demodicidae. 

 VII 12. Eriophyidae. 



I consider superfluous the giving names to the groups IH — VII. 

 This is only necessary as soon as two fainihes are united. 



Classification of the Parasitidae. Relying upon the facts, which 

 led me in classifying the Acari, I projected a table of the sub- 

 families of the Parasitidae in the Tijdschrift voor Entomologie, 

 V. 45, p. 50, which unites possibly the related subfamilies, and 

 puts foremost the possibly most ancient subfamilies, whilst the 

 younger ones follow. I project here a new table, which contains 

 also the exotic subfamilies. The table is at the same time a «key». 

 i $ genital opening before the 

 ^ I sternal shield 2 



i$ genital opening in the sternal 

 shield 7 



iî genital shield single. ... 3 

 Î genital shield double, a left 

 and a right one 6 



I i Id leg unequal to that of ?. I. Parasitiuae. 



i i '2d leg equal to that of $ . 4 



[ The adults live free and are well 



I chitinized ....... II. Laelaptinae. 



4. < The adults are parasites of Ver- 

 1 tebratesand are less chitinized, 

 I even often soft 5 



