AMERICAN DIPTERA. 



233 



PLATE XI. 

 Fig. 50. Pachyrrhina polymera, apical appendages of left side, outer view. 



51. Ingens, terminal half of abdomen, lateral view. 



52. " incurva, central vesicle (c. v.), penis (p.) and guard of penis 

 (p. g.), left view. 



53. Pachyrrhina incurva, terminal part of abdomen, lateral view. 



54. lugens, apical appendages of left side, outer view. 



55. ferruginea, guard of penis {p. g.) and second gonapophyses 

 (gon. 2) with their apodemes (ap.), dorsal view. 



56. Pachyrrhina ferruginea, hypopygium, left view; m, intersegmental mem- 

 brane between eighth segment and hypopygium. 



57. Pachyrrhina pedunculata, central vesicle (c. v.), penis {-p.) and guard of 

 penis (p. g.), left view. 



58. Pachyrrhina pedunculata, apical appendages of left side, outer view. 



59. " apical half of abdomen, lateral view. 



60. polymera, terminal part of abdomen, lateral view. 



PLATE XII. 



Fig. 61. Tipula illustris. distal half of abdomen, lateral view, x 18. 



62. " " apical appendages of left side, outer view. 



63. " " ventral view of hypopygium. 



64. " fumosa, terminal part of abdomen, lateral view, x 20. 



65. " " apical appendages of left side, outer view. 



66. " sulphurea, apical appendages of left side, outer view. 



67. " illustris, guard of penis, dorsal view. 



68. " spernax, apical appendages of left side, outer view. 



69. " brevicollis, sternum and pleural plates of hypopygium, ventral view. 



70. " carinata, hypopygium with appendages removed, ventral view. 



71. " " apical appendages of left side, outer view. 



72. " dorsolineata, terminal -part of abdomen, lateral view, x 15; p. 

 penis projecting from genital chamber. 



73. " lamellata, tergum of hypopygium, dorsal view. 



74. " dorsolineata, apical appendages of left side, outer view. 



75. '" guard of penis, dorsal view. 



76. " lamellata, apical appendage of left side, outer view. 



77. " " apical half of abdomen, lateral view, x 10. 



PLATE XIII. 



Fig. 78. Tipula sequalis, distal half of abdomen, lateral view, x 15. 



" 79. '" " apical appendages of left side, outer view. 



" 80. " cineracea, terminal part of abdomen, lateral view, x 15. 



"81. " guard of penis, dorsal view. 



" 82. " cineracea, guard of penis, lateral view. 



" 83. " " apical appendages of left side, outer view. 



TRANS. AM. ENT. SOC. XXX. 



(30) 



AUGUST. 1904. 



