PROC. ENT. SOC. WASH., VOL. 21, NO. 6, JUNE, IQIQ 



Fig. 32. Genitalia of Cephaleia frontalis (Westw.), -ossicular surface (primi- 



tively) ventral. 

 Fig. 33. Genitalia of Pamphilius persicus (MacG.), ossicular surface 



(primitively) ventral? 

 Fig. 34. Genitalia of Dermapteron (Euplexopteron) Echinosoma occidental*, 



ventral view. 

 Fig- 35- Terminal segments and gonopods of Mecopteron Merope tuber, 



male, dorsal view (after Crampton, 19180). 

 Fig. 36. Genitalia of Tremex columba (Linn.), ossicular surface, (primi- 



tively) ventral. 

 Fig. 37. Genitalia of Oryssus sayii (Westw.), abossicular surface? (primi- 



tively) dorsal? 

 Fig. 38. Genitalia of Oryssus sayii (Westw.), ossicular surface? (primi- 



tively) ventral? 

 Fig. 39. Genitalia of Dolerus collaris (Say), abossicular surface, (second- 



arily) ventral. 

 Fig. 40. Genitalia of Dolerus collaris (Say), ossicular surface, (secondarily) 



dorsal. 

 Fig. 41. Genitalia of Tremex columba (Linn.), abossicular surface, (primi- 



tively) dorsal. 



Fig. 42. Terminal structures of Oryssus sayii (Westw.), male, lateral view. 

 Fig. 43. Terminal structures of larva of Pteronidea, lateral view. 

 Fig. 44. Terminal structures of larva of Neurotoma, lateral view. 

 Fig. 45. Genitalia of Sirex edwardsii abossicular surface (primitively) 



dorsal. 

 Fig. 46. Terminal structures of Xiphydria mellipes (Say), male, lateral 



view. 

 Fig. 47. Terminal structures of larva of Tremex columba (Linn.), lateral 



view. 



Fig. 48. Terminal structures of larva of Cephus, lateral view. 

 Fig. 49. Terminal structures of Tremex columba (Linn.), male, lateral view. 

 Fig. 50. Terminal structures of Hemitaxonus dubitatus (Nort.), male, lateral 



view. 



Fig. 51. Terminal structures of larva of Megaxyela, lateral view. 

 Fig. 52. Terminal structures of Trichopteron Philopotamus sp., male, 



lateral view. 

 Fig. 53. Genitalia of Sirex edwardsii ossicular surface (primitively) ven- 



tral. 



Fig. 54. Terminal segments, dorsal view, Xiphidria mellipes, Say. 

 Fig- 55- Terminal structures of Cephus cinctus (Nort.), male, lateral view. 

 Fig. 56. Terminal structures of Megaxyela aenea (Nort.), male, lateral view. 

 Fig. 57. Terminal ventral segments of Megaxyela aenea (Nort.), male. 

 Fig. 58. Terminal structures of ephemerid Heptagenia inter punctate, male, 



lateral view (after Crampton, 



