ameri(;an diptera. 



233 



PLATE XI. 

 Fig. 50. Pachi/rrhina polymera, apical appendages of left side, outer view. 



" 51. " lugenii, terminal half of alidomen, lateral view. 



" 52. ■' mcnrva, central vesicle (c. v.), penis {p.) and guard of ])enis 



(p. (J.), left view. 



" 5.3. Pachi/rrhina incurva. terminal part of abdomen, lateral view. 



" 54. ■' lugens, apical appendages of left side, outer view. 



■' 55. " ferriiginea, guard of penis ( p. (;. ) and second gonapophyses 



{gon. 2) with tlieir apodemes {np.), dorsal view 



" 5(!. Prtc/i,)/'"''''»"«./isrr((f;Mtm, hypopygium, left view; m, intersegmental mem- 

 brane between eighth segment and hypopygium. 



" 57. Pachi/rrhina pedimculata, e.eutva] vesicle (o. ■!>.), penis ( y;.) and guard of 

 penis {p. g.), left view. 



" 58. Pachi/rrhina pediinciilata, apical appendages of left side, outer view. 



" 59. " " apical half of abdomen, lateral view. 



'■ 60. " polymera, terninial part of abdomen, lateral view. 



Fig. Gl. 



" 62. 



" 63. 



" 64. 



" 65. 



" 66. 



" 67. 



" 68. 



" 69. 



" 70. 



" 71. 



PLATE XII. 

 Tipida illnatris. distal half of abdomen, lateral view, x 18. 

 " apical appendages of left side, outer view. 

 " ventral view of hypopygium. 

 fnmosa, terminal part of abdomen, lateral view, x 20. 



" apical appendages of left side, outer view. 

 ■sulphitrea, apical appendages of left side, outer view. 

 illusfris, guard of penis, dorsal view. 

 spernax, apical appendages of left side, outer view 

 &rei'icoHis, sternum and pleural plates of hypopygium, ventral view. 

 carinata, hypopygium with appendages removed, veutral view. 



" a])ical apiiendages of left side, outer view. 

 dorsoJineata, terminal part of abdomen, lateral view, x 15; p. 

 penis projecting from genital chamber. 

 lameUata, tergum of hypopygium, dorsal view. 

 dorsolineata, ajiical appendages of left side, outer view. 



" guard of penis, dorsal view. 



lamellata, apical appendage of left side, outer view. 

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



PLATE XIIL 



Fig. 78. Tipida xqualis, 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. 



