il 



12 



15 



16 



17 



(dr. a. C. OUDEMANSj. NEW LIST OF DUTCH ACARI, II. 41 



No mentum? P. kempersi Oudms. 



Mentum present 12 



Colour pale 13 



Colour brown 14 



Démarcation between the dorsal 

 13. { shields arched hindward . . .P. rubescens(G. et R.Can.) 

 ' Demarcation stiaight P. coleoptratorum (L.) 



ÌC? femur 2 with spur and little tu- 

 bercle 15 

 <? femur 2 with two little tuberclesl 6 



Epistema multidentate; anterior dor- 

 sal shield nearly two times as 

 long as posterior P. exilis (Beri.) 



Epistema tridentate; dorsal shields 



almost equal in length . , .P. longulus (C. L. Koch). 



c? genu 2 with spur curved toward 



tibia P. tiberinus (G. Can.) 



(? genu 2 with spur curved toward 



femur P, dent pes (C. L. Koch). 



2 ventral shield posteriorly fused 



with dorsal P. calcaratus (C, L. Koch), 



$ ventral shield free 18 



Epistema bicuspidate P. wasmanni Oudms. 



18. ) Epistema tiicuspidate; one dorsal 

 shield (see also above sub 15) .P. longulus (G. L. Koch). 



Epistema qulnquecuspidate . . .19 

 I $ hern of hypostoma with horizontal 



19. thorn P. canestrinii (Beri.) 



I S hern of hypostoma usual. . .20 



i tibia 2 with enormous spur, or 



20. ) otherwise-shaped apophysis di- 

 rected towards distal end . .P. c-'assipes (L ) 



S tibia 2 otherwise . . , . .21 

 { S femur 2 with 2 little tubercles . .P. septentrionalis Oudms. 



21. < (? femur 2 with moderate spatulate 



( apophysis P. meridionalis (Beri.) 



