285 



cf femur 2 with long spur and 



little tubercle P. furcatus (G. etU. Can.). 



cf femur 2 witii short spur and big 



tubercle P . cornutus (G . etR. Can.). 



( No mentum P. kempersi Oudms. 



j Mentum present 8. 



\ Colour pale 9. 



{ Colour brown 10. 



iDemarcation between dorsal shields 

 arched backward P. rubescens (G. etR. Can.). 

 Demarcation straight P. coleoptratorum (L.). 



!(ƒ femur 2 with spur and little 

 tubercle 11. 

 C? femur 2 with 2 little tubercles. 12. 

 Epistoma multidentate; anterior dor- 

 sal shield two times as long as 



11 / posterior one P. exilis (Berl.) 



Epistoma tridentate; dorsal shields 



almost equal in length . . . P. longidus (C. L. Koch). 

 / cT genu 2 with spur directed toward 



^ tibia P. tiberinus (G. Can.). 



\ (f genu 2 with spur directed toward 



femur P. dentipes (C. L. Koch). 



!9 ventral shield posteriorly fused 

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

 9 ventral shield free 14. 



Epistoma bidentate P. toasmanni Oudms. 



Epistoma otherwise 15. 



Epistoma tridentate (forms with one 

 dorsal shield; compare above 1 



and 11) P. longidus {0. L. Koch). 



Epistoma quinquedentate. . . . 16. 



!cf horns of hypostome with hori- 

 zontal thorn P. canestrinii (Berl.). 

 (f horns of hypostome as usual . 17. 



14 



15 



