2 



81 



[ Sternal shiekl witb broail trans- 

 verse chitinization P. fucorum (de Geer). 



I Sterual shield with chitinized mar- 



( gius P. subterraneus (J. Müll.). 



f The coxae of the palps and of 



J legs 2 and 3 with a short, stout, 



clublike hair P. sexclavatus Oudms. 



[ No such clubs 4 



Epistoma with one rounded lobe 

 and scarcely visible rounded la- 



teral cusp P. bomborum Oudms. 



Epistoma otherwise P. vespillonum Oudms. 



Adults. 



I Two distin et dorsal shields. . . 2 

 j One dorsal shield 14 



! Epistoma multidentate .... 3 

 Epistoma at the most quiuque- 

 dentate 4 



[ With accessory claws; cf leg 3 



with spur P. marinus (Brady.). 



I Without accessory claws; cf leg 3 



| unarmed P. exilis (Berl.). 



Icf horns of hypostome sessile . 5 

 (ƒ horns of hypostome pedunculate 9 

 l cf tarsus 2 with one or 2 spurs. 6 

 | cf tarsus 2 unarmed 7 



!Shoulder-hairs and hairs on posterior 

 margin rod-like, distally hairy. P. spinipes (C. L. Koch). 

 No such hairs P. magnus (Kram.). 



( 9 with comb-like hair on 2 d art. 



of palp P. evertsi Oudm. 



) 9 w itli trifurcate hair on 2 a art. 

 ( of palp , . . 8 



