EXPLANATION OF PLATES 

 Plate 1 



Figures 1, 2. Diodontus trlsnlcus: 1, Wings; 2, hypopygidium of male (a, dorsal 

 view of I'ight half; b, lateral view from left side). 



3. Psen {Pseneo) fulvlpes: Apex of clypeus of female. 



4. P. (P.) kolilii: Hind femnr, posterior view. 



5,6. P. {Psen) monticola: 5, Fore wing; 6, hind wing. 

 7,8. P. (Mimumesa) cJijpcatus: 7, Ventral view of right side of head; 

 8, apex of clypeus of female. 

 9. P. (M.) niger: Ventral view of right side of head. 



10. P. (M.) mellipes: Antenna of male. 



11. P. (M.) modestus: Fropodeum. 



12. P. (M.) modestus var. retictilatus : Fropodeum. 



13,21. P. {Mimesa) cressoni: 13, Fropotteum ; 21, male hypopygidium 

 ( a, dorsal view of right side ; b, lateral view from right ; c, 

 apical ventral styles in profile). 

 14. P. (Jf.) pygldialis: Apex of sixth tergite of abdomen of male. 



15,16. P. {M.) arizonensis: 15, Fropodeum; 16, petiole of abdomen from 

 left. 



17. P. {M.) argentifrons : Fetiole of abdomen from left. 



18. P. (M.) pauper: Petiole of abdomen from left. 



19. P. (M.) proximus: Apex of clypeus of female. 



20. P. (M.) coquilletti: Apex of clypeus of female. 



Plate 2 



Figure 22. Psen (Mime-sa) pygidiulis: a, Internal hyiwpygial processes; b, 

 penultimate abdominal sternite of male. 



23,29,86,37. Psenia stiff iisu : 23, Hind wing; 29, central ventral portion of cari- 

 nae of head; 36, hypopygidium of male (o, ventral view of 

 right side ; b, dorsal view of right side ; c, apex of terminal por- 

 tion of style of marginata) ; 37, ventral view of apical sternites 

 of male with hypopygidium in normal position. 



24. Diodontus sp. : Anal lobe of hind wing. 



25. Psen sp. : Anal lobe of hind wing. 



26. Psenia sp. : Anal lobe of hind wing. 



27,33,38. Psenia tibialis: 27, Ventral view of right side of head; 33, enclo- 

 sure of propodeum ; 38, apical and preapical sternites of male 

 from below. 

 28. P. longiventris : Antenna of male. 

 30,39. P. pallidistigma: 30, Ventral view of right side of head; 39, 

 enclosure of propodeum. 



31. P. angulicornis: Antennal fiagellum of male. 



32. P. rufibasis: Enclosure of propodeum. 

 84. P. aerofades: Enclosure of propodeum. 

 35. P. elavicornis : Enclosure of propodeum. 



40. P. marginata: Apical sternite of male. (See also figure 36, c.) 



41. P. brevipetiolata: Enclosure of propodeum. 

 60 



U.S. GOVERNMENT PRINTING OFFICE: 1933 



