WILLIAM G. DIETZ 139 



EXPLANATION OF PLATES 



Plate IV 



Fig. 1. — Wing of P. oslari. 

 Fig. 2. — Wing of P. macrophallus. 

 Fig. 3. — Wing of P. puncticollis. 

 Fig. 4. — Wing of P. hirsutula. 

 Fig. 5. — Wing of P. urocera. 

 Fig. 6. — Wing of P. cornifera. 

 Fig. 7. — Wing of P. calinota. ■ 

 Fig. 8.— Wing of P. montana. 

 Fig. 9. — Wing of P. opacivittata. 

 Fig. 10. — Wing of P. evasa. 

 Fig. 11. — Wing of P. nexilis. 



Plate V 



Fig. 12. — Wing of P. festina. 

 Fig. 13. — Wing of P. costomarginata. 

 Fig. 14. — Wing of P. beutenmuelleri. 

 Fig. 15. — Wing of P. obliterata. 

 Fig. 16.— Wing of P. wyalusingensis. 

 Fig. 17. — Wing of P. cingulata. 

 Fig. 18. — Wing of P. lateviltata. 

 Fig. 19. — Wing of P. approximates. 

 Fig. 20. — Wing of P. stigmatica. 

 Fig. 21. — Hypopygium 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 penis -guard 

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



TRANS. AM. ENT. SOC, XLIV. 



