74 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[244 



EXPLANATION OF PLATE 

 Caudal Aspect of the Head 



Fig. 91. Bibio femoratus, male. 



Fig. 92. Bihio femoratus, female. 



Fig. 93. Liiiinobia immatura. 



Fig. 94. Sphyracephala brevicornis. 



Fig. 95. Tipula bicornis. 



Fig. 96. Psorophora cilia ta, female. 



Fig. 97. Eiiipis clausa, female. 



Fig. 98. Exoprosopa fasciata. 



Fig. 99. Mydas clavatus. 



Fig. 100. Psilocephala haeniorrhoidalis, female. 



Fig. loi. Ochthera mantis. 



Fig. 102. Lonchoptera lutea, female. 



Fig. 103. Leptis vertebrata, male. 



Fig. 104. Stratiomyia apicula, male. 



Fig. 105. Oncodes costatus. 



Fig. 106. Piptmculus cingulatiis, female. 



Fig. 107. Sccnopinns fcncstralis. 



Fig. 108. Dolichopus sp. 



Fig. 109. Oncodes costatus, ventral aspect. 



Fig. no. Platypeza velutina. 



Fig. III. Aphiochaeta agarici. 



Fig. 112. Dolichopus bifractiis, lateral margins incomplete. 



