WILLIAM G. DIETZ 139 



EXPLANATION OF PLATES 



Plate IV 



Fig. 1. — Wing of P. oslnri. 

 Fig. 2. — ^^Ving of P. macro phallus. 

 Fig. 3. — ^Wing of P. puncticolUs. 

 Fig. 4. — Wing of P. hirsiUida. 

 Fig. 5. — Wing of P. urocera. 

 Fig. 6. — Wing of P. cornifera. 

 Fig. 7. — Wing of P. calinota. 

 Fig. 8. — Wing of P. tiwntana. 

 Fig. O.^Wing of P. opaciuittnta. 

 Fig. 10. — Wing of P. euasa. 

 Fig. 11. — Wing of P. nexiiis. 



Plate V 



Fig. 12.— Wing of P. /e.s-^i/ia. 

 Fig. 13. — ^Wing of P. coslomarginata. 

 Fig. 14. — Wing of P. beiitenmiielleri. 

 Fig. 15. — ^Wing of P. ohliterala. 

 Fig. 16. — Wing of P. wyalmingensis. 

 Fig. 17. — ^\Ying of P. cingulata. 

 Fig. 18. — Wing of P. latevillata. 

 Fig. 19. — Wing of P. approximata. 

 Fig. 20. — Wing of P. sligmatica. 

 Fig. 21.— Hypopygiiim of P. oslari; lateral aspect. 

 Fig. 22. — Hypopygium of P. hybrida; lateral aspect. 



Fig. 23.— Hypopygium of P. okefenoke; dorsal aspect (from a paratype kindly 

 given me by Mr. C. P. Alexander). 



Plate VI 



Fig. 24. — Hypopygium of P. macrophallus; lateral aspect. 



Fig. 25. — Hypopygium of P. urocera; lateral aspect. 



Fig. 26. — Hypopygium of P. cornifera; dorsal aspect. 



Fig. 27. — Hypopygium of P. tenuis; ventral aspect; 27 A, outer and inner 

 appendages, seen from within; 27 B, anterior end of peais-^uard 

 with its geniculate, rod-like processes (Snodgrass). 



TRANS. AM. ENT. SOC, XLIV. 



