40 (dr. a. C. OUDEMANS). KEW list CF dutch acari, II. 



the genital plate, the distinct demarcation between genital and 

 ventri-anal shields and the distribution ot' the tew hairs. 



46. Key to the species of Parasitus Latr. 



( Two distinct dorsal shields . . .'2 

 1. 



( Only one dorsal shield . . . .17 



Immovable finger of mandible with 



hyaline apophysis in top . . .3 

 Immovable finger of mandible with- 

 out such , 4 



Sternal shield with broad transverse 

 Q j stronger chitinization . . . .P. fucorum (de Geer). 

 Sternal shield with pentagonal frame 



of stronger chitinization . . P. subterraneus (Jul. Müller). 

 ( Post, dorsal shield truncated poste- 



4. ^ riorly P. emarginatus (C L. Koch). 



f Post, dorsal shield rounded . . .5 

 Epistema with 5 cusps, the middle 

 and the two outer lateral longer 

 \ than the inner lateral ones, . .P. vespillonum Oudms. 

 Epistema otherwise 6 



! Epistema with one rounded lobe and a 

 scarcely visible lateral rounded cusp. P. bomborum Oudms. 

 ■ Epistema otherwise 7 



( (? horns of hypostoma sessil . . .8 

 j i horns of hypostoma pedunculate. 1 1 

 ( <? tarsus 2 with a long spur. . .9 

 I $ tarsus 2 without spur . . .10 

 On shoulders and posterior margin of 



abdomen two subpiumose hairs .P. spinipes (C. L. Koch). 



No such hairs P. magnus (Kram.) 



S femur 2 with long spur and little 



tubercle P. furcatus (G. et R. Can.) 



10. j (? femur 2 with short spur and big 



tubercle P. cornutus (GetR. Can.) 



7. 



