548 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Fig. 61. — Hypopygium of G. (L.) alexanderi; ventral aspect of the pleural 



appendages; lettering as in Fig. 59. 

 Fig. 62. — Hypopygium of G. (L.) cinerea; ventral aspect of the pleural 



appendages; lettering as in Fig. 59. 

 Fig. 63. — Hypopygium of G. (L.) puer; dorsal aspect of right pleurite; 



p.gd. = penis-guard. 

 Fig. 64. — Hypopygium of G. (L.) manca; dorsal aspect of right pleurite; 



lettering as in Fig. 63. 

 Fig. 65. — Hypopygium of G. (L.) manca; lateral aspect; lettering as in 



Fig. 63. 

 Fig. 66. — Hypopygium of G. (Gonomyia) californica; dorsal aspect of the 



right pleurite; lettering as in Figs. 59 and 63. 

 Fig. 67. — Hypopygium of G. (G.) californica; ventral aspect; lettering as in 



Figs. 59 and 63. 

 Fig. 68. — Hypopygium of G. (G.) blanda; dorsal aspect of the right pleurite; 

 • lettering as in Fig. 59. 

 Fig. 69. — Hypopygium of G. (G.) blanda; ventral aspect of the ventral 



appendage of the pleurite. 

 Fig. 70. — Hypopygium of G. (G.) svlphurella; dorsal aspect of the right 



pleurite. 

 Fig. 71. — Hypopygium of G. (G.) florens; dorsal aspect of the right pleurite; 



k = dorsal fleshy knob; d = first or dorsal appendage; 2 = second 



pleural appendage; 3 = third or ventral pleural appendage. 

 Fig. 72. — Hypopygium of G. (G.) florens; lateral aspect of the penis-guard. 

 Fig. 73. — Hypopygium of G. (G.) cognatella; lateral aspect of the penis-guard. 

 Fig. 74. — Hypopygium of G. (G.) cognatella; dorsal aspect of the right 



pleurite; lettering as in Fig. 71. 

 Fig. 75. — Hypopygium of G. (G.) cognatella; lateral aspect of the pleurite; 



lettering as in Fig. 71. 



Plate XXX. — Fig. 76. — Hypopygium of Gonomyia (Gonomyia) flavibasis; 



dorso-lateral aspect. 

 Fig. 77. — Hypopygium of G. (G.) flavibasis; ventral aspect of the pleural 



appendages. 

 Fig. 78. — Hypopygium of G. (G.) flavibasis; apex of the ventral appendages. 

 Fig. 79. — Hypopygium of G. (G.) noveboracensis; pleural appendages, ventral 



aspect. 

 Fig. 80. — Hypopygium of G. (G.) noveboracensis; ventral aspect of the left 



side of the penis-guard and the gonapophyses ; a, b, c = horns of the 



fused cylinder. 

 Fig. 81. — Hypopygium of G. (G.) filicauda; dorsal aspect of the right pleurite; 



d = dorsal pleural appendage; v = ventral pleural appendage. 

 Fig. 82. — Hypopygium of G. (G.) filicauda; lateral aspect of the penis-guard. 

 Fig. 83. — Hypopygium of G. (G.) subcinerea; dorsal aspect of the right 



pleurite; lettering as in Fig. 81. 

 Fig. 84. — Hypopygium of G. (G.) subcinerea; ventral aspect of the left side 



of the penis-guard. 

 Fig. 85. — Hypopygium of G. (G.) subcinerea; dorsal pleural appendage. 

 Fig. 86. — Hypopygium of G. (G.) cequalis Alexander; dorsal aspect of the 



right pleurite: lettering as in Fig. 81; a.t. = anal tube. 

 Fig. 87. — Hypopygium of G. (G.) virgata; dorsal aspect of the right pleurite; 



lettering as in Fig. 81; 2 = second pleural appendage. 

 Fig. 88. — Hypopygium of G. (G.) unicolor Alexander; ventral aspect of the 



penis-guard and the gonapophyses; p.gd. = penis-guard; a = subtending 



arm; g= gonapophyse. 

 Fig. 89. — Hypopygium of G. (G.) unicolor; dorsal aspect of the right pleurite; 



lettering as in Fig. 81. 

 Fig. 90. — Hypopygium of G. (G.) mexicana Alexander; ventral aspect of 



the penis-guard; lettering as in Fig. 88. 

 Fig. 91. — Hypopygium of G. (G.) mexicana; dorsal aspect of the right pleurite; 



lettering as in Figs. 81 and 87. 



