CHARLES W. METZ. 155 



61. P. fievadensis. Seventh ventral plate. 



62. P. fievadettsis . Eighth ventral plate. 



63. P. calvus. Eighth ventral plate. 



64. P. coloradensis . Eighth ventral plate. 



65. P. polifolii. Eighth ventral plate. 



66. P wootoni. Eighth ventral plate. 



67. P. asininus. Eighth ventral plate. 



68. P. cookii. Eighth ventral plate. 



69. P. tnodeslus. Seventh ventral plate. 



70. P. modestus. Seventh ventral plate. 



71. P. fossata. Seventh ventral plate. 



72. P. modestus. Seventh ventral plate. 



73. P. episcopalis. Seventh ventral plate. 



74. P. episcopalis. Seventh ventral plate. 



75. P. episcopalis var. coquillettii. Seventh ventral plate. 



76. P. episcopalis. Seventh ventral plate. 



Platk VI. 



Face drawings of males. 

 n . P. cressoni var. magniclavis (paratype of P. magniclavis) . 



78. P. cressoni. 



79. P. cressoni. 



80. P. cressoni form tnesillce. 



81. P. cressoni. 



82. P. cressoni. 



83. P. cressoni form saniculce. 



84. P. grossicornis . 



85. P. varifrons. 



86. P. tridentulus. 



87. P. grossicornis (type). 



88. P. rudbeckicg var. granulatus. 



89. P. rudbeckics. 



90. P. rudbeckice. 



91. P. conspicua. 



92. P. basalis. 



Plate VII. 



Face drawings of males. 



93. P. modestus. 



94. P. modestus. 



95. P. modestus 



96. P. modestus var. illinoiensis. 



97. P. modestus. 



98. P. modestus. 



99. P. modestus. 



100. P. modestus var. minyra. 



101. P. zizics. 



TRANS. AM. ENT. SOC, XXXVII. 



