59Q MR. R. E. TURXEU OX 



6. Slender species; abdomen entirely black, without 



pubescence 7. 



More robust sjiecies ; apical margin of abdominal 

 segments dull brown, clothed with dull fulvous 

 pubescence P. exclusum Turn. 



7. Legs more or less ferruginous 8. 



Legs black ; tarsi rarely luteous 9. 



8. Antennae, trochanters, and femora ferruginous ; ner- 



vures testaceous P. erijtlirocervs Kohl. 



Antenna;, trochanters, and femora black ; nervures 



black P. simulans Turn. 



9. Cubital margin of the second cubital cell scarcely or 



not at all longer than the first transverse cubital 



nervure 10. 



Cubital margin of the second cubital cell much 



longer than the first transverse cubital nervure ... 11. 



10. Tarsi luteous ; wings strongly iridescent P. aherransTwen. 



Tarsi black; wings very feebly iridescent P. tenehrosum Turn. 



11. With a small triangular enclosed space at the base 



of the median segment ; clypeus broadlj^ rounded 



at apex P. noctulum Turn. 



Without an enclosed space at the base of the median 

 segment; clypeus produced on the middle of the 

 apical margin P. caliginosmn Turn. 



12. Thorax, abdomen, legs, and antennae testaceous, head 



only black ; second recurrent nervure received [Turn. 



before the middle of the second cubital cell P. meJanocephalum 



Thorax always black; second recurrent nervure re- 

 ceived at or beyond the middle of the second 

 cubital cell 13. 



13. Second recurrent nervure received at the middle of 



the second cubital cell ; first recurrent received 



well before the apex of the first cubital cell . .; 14. 



Second recurrent nervure received either near the 

 apex of the second cubital cell or close to the base 

 of the third cubital cell, or interstitial with the 

 second transverse cubital uervure 17. 



14. Abdomen and antennse black 15. 



Abdomen and antennae more or less ferruginous 16. 



15. Entirelj' black ; with a continuous impressed trans- 



verse line behind the posterior ocelli F. ignaimmTxixn. 



Legs ferruginous, the impressed line behind the pos- 

 terior ocelli interrupted P. rujipes Shuck. 



16. Pubescence of the clypeus and front golden ; distance 



separating the eyes on the clypeus more than half 

 as great again as that separating them on the 



vertex P. virosum Turn. 



Pubescence of the clypeus and front whitish ; dis- 

 tance separating the eyes on the clypeus much 

 less than half as great again as that separating 

 them on the vertex P. ruficortiis Sm. 



17. Second ventral segment shining, almost or entirely 



impunctate 18. 



Second venti-al segment closely aud more or less dis- 



tinctlj' punctured 21. 



18. Third and fourth joints of the flagellum strongly 



dilated beneath P.fenestratvs Sm., $ . 



Third and fourth joints of the flagellum not dilated. 19. 



19. Of slender build; entirely black; median segment 



finely and not very closelj' punctured P. priscum Turn. 



Of robust build ; median segment closely and coarsely 



punctured or punctured-striate 20. 



20. Dorsal segments 2-5 with a broad apical band of 



golden pubescence, and a testaceous brown chiti- 



nous band beneath the pubescence P.festivus .Sm. 



Dor.sal segments 2-5 entirely black, with an apical 



band of whitish pubescence P.feiiestrafiis Sm., $ . 



