232 R. E. SNODGRASS. 



PLATE IX. 

 Fig. 13. Epiphragma forcipennis, distal half of abdomen, lateral view, x 20. 



14. Limnophila cubifalis, terminal hal!' of abdomen, lateral view. 



15. Epiphragma forcipennis, second gonapophyses of left side and its ape 

 deme {ap.) lateral view. 



16. Limnobia sciophila, terminal part of abdomen, lateral view, x 22J. 



17. Limnophila rufibasis, guard of penis, left side, showing position of penis 

 Cp.} within. 



18. Limnophila quadrata, terminal part of abdomen, dorsal view, x 25. 



19. Limnobia sciophila, apical appendage of hypopygium. 



20. " " guard of penis (/>.(;.) and second gonapophy ses (pon. 

 2), ventral view. 



21. Limnophila rufibasis, base of penis, dorsal view. 



22. " " left apical appendage of hypopygium, lateral view. 



23. " " terminal part of abdomen, dorsal view, x 18. 



24. Amalopis constans, sternum, ventral view. 



25. Limnophila rufibasis, second gonapophyses of left side. 



26. Amalopis constans, dorsal view of hypopygium with appendages removed. 



27. " ampla, left apical appendage of hypopygium, lateral view. 



28. " " sternum of hypopygium, ventral view. 



29. " " tergum of hypopygium, dorsal view. 



30. " " terminal part of abdomen, lateral view, x 15. 



31. " constans, left apical appendage of hypopygium, inner view. 



32. " " terminal part of abdomen, lateral view, x 15. 



PLATE X. 

 Fig. 33. Limnobia sciophila, terminal part of abdomen, dorsal view, x 25. 



34. Limnophila quadrata, guard of penis {p. g.) and second gonapophyses of 

 left side {gon. 2) with its apodeme {ap.), left view. 



35. Bittacomorpha clavipes, hypopygium, left side ; m, intersegmental mem- 

 brane between eighth segment and hypopygium. 



36. Bittacomorpha clavipes, guard of penis with penis projecting, dorsal view. 



37. " " tergum of hypopygium, dorsal view. 



38. " " sternum of hypopygium, ventral view. 



39. " " left pleurum of hypopygium with base of apical 

 appendage attached (ap. ap.) and dorsal transverse process. 



40. Ptychoptera lenis, terminal part of abdomen, lateral view. 



41. " " tergum of hypopygium, dorsal view. 



42. " " penis, dorsal view. 



43. Ctenophora angustipennis, left lower apical appendage of hypopygium, 

 external view. 



44. Ptychoptera lenis, left sternal lobe of hypopygium, lateral view. 



45. " " left apical appendage of hypopygium, lateral view. 



46. Ctenophora angustipennis, left middle apical appendage of hypopygium, 

 lateral view. 



47. Ctenophora angustipennis, hypopygium, dorsal view. 



48. " " guard of penis, left view. 



49. " " terminal part of abdomen, lateral view, x 10. 



