(dr. a. c. oudbmans). notes on acari. 



99 



3. 



5. 



7. 



9. 



10. 



Body hard, brown, with many, well 



I chitinized, black dorsal shields . I CoecuUnae. 

 \ Body weak, with very weak shields, 



I or without such 2 



[ Larves free living, resembling the 



adults 3 



' Larves parasitic, very anomalous , 10 



f $ with penis ^ 



\ i without penis 7 



( Mandibles external 5 



^ Mandibles internal 6 



t Mandibles uncinate 11 Anystinae. 



Ì Mandibles stylate Wl RhapUgnathinae. 



I Mandibles chelate IV Cryptognathinae. 



\ Mandibles stylate V Cheletlnae. 



L Mandibles chelate 8 



( Mandibles otherwise 9 



[ Mandibles short, stout, with large 



I chelae VI Poecllophys'mae. 



{ Mandibles short, with small chelae. Vit Pachygnath'mae. 

 I Mandibles long, or very long, with 



minute chelae; palps distally unarmed Vili Bdellinae. 

 . Mandibles shoit, with one falciform 



) and one membranous finger . . XI Eupodinae. 



Mandibles long, uncinate; palps dis- 

 tally with claw X Ctmaxinae. 



Mandibles external, uncinate . . XI Thromhidiinae. 



Mandibles internal, stylate.. . . Xll Erythraeinae. 



Classification of Tarsonemidae. This family contains only a few 

 genera, which are not united in subfamilies. 



Classification of Hydrarachnidae. In the most recent systematic 

 •work, viz. that of Dr. R. Pierstg, Das Tierreich, 13e Lief., this 

 family is not broken up or divided in subfamilies, though, as to me, 

 the 55 fresh-water-genera may be arranged in well limited natural 



