4. 



2. 



3. 



(dr. a. C. OtJUEMANS). NOTKS ON ACARI VI. 



12. Key to the tribus and genera of Tyroglyphinae. 



I Claws of tlie legs normal (i. e. 

 I sessile) . 2 



Claws of the first two pair of 

 legs born on long peduncles 3 



Mandibles normal (i. e. chelate) Tyroglyphae. 



2. { Mandibles saw-like or knife-like, 

 both in form and action . Histiostomae. 



3. Only one tribus Lentungulae. 



Tijrocjlijphac, 



{ Female without copulation-tube 2 

 '1. (Female with projecting copula- 

 tion tube 15 



Demarcation between Cephth. 



and Abd 3 



No demarcation between Cephth, 



and Abd 11 



$ without anal suckers. . . 4 



Ì $ with anal suckers. ... 5 

 r ? without genital suckers . . Nanacarus Oudms. 

 • \ 5 with genital suckers . . . Saproglyphus Beri. 



/No sternum Mealia ïrt. 



5 ' 



\ Sternum present 6 



1 Posterior margin of Abd. normal 7 

 $ posterior margin of Abd, with 

 a projecting blade. . . .10 



{Legs 1 normal 8 

 Legs 1 much thicker than the 



other legs ; femur 1 spurred 9 



L With ambulacral suckers . . Tyrog(yphus Latr. 



( Without ambulacral suckers . HypopiiS Dujard. 



9. Only one genus Aleurobius Can. 



10. Only one genus Histiogaster Beri. 



