100 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[270 



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EXPLANATION OF PLATE 



Labium 



Chloropisca glabra, caudal aspect. 



Chloropisca glabra, cephalic aspect. 



Doliclwpus bifractus, mesal aspect. 



Dolichopus bifractus, caudal aspect. 



Dolichopus bifractus, lateral aspect. 



Pipunculus cingulatus, caudal aspect. 



Pipunculus cingulatus, cephalic aspect. 



Borborus equinus, caudal aspect. 



Borborus equinus, mesal aspect. 



Sepsis violacea, caudal aspect. 



Sepsis violacea, mesal aspect. 



Eristalis tenax, mesal aspect. 



Eristalis tenax, caudal view. 



Eristalis tenax, distal end of theca, caudal aspect. 



Ochthera mantis, caudal aspect. 



Ochthera mantis, mesal aspect. 



Calobata univitta, mesal aspect. 



Calobata univitta, caudal aspect. 



Coelopa vanduseii, caudal aspect. 



Coelopa vanduseii, mesal aspect. 



Sphyracephala brevicomis, caudal aspect. 



Sphyracephala brevicomis, mesal aspect. 



Oecothea fenestralis, caudal aspect. 



Oecothea fenestralis, mesal aspect. 



Drosophila ampelophila, caudal aspect. 



Drosophila ampelophila, mesal aspect. 



Chrysomysa demandata, mesal aspect. 



Chrysomyza demandata, caudal aspect. 



Siphona geniculata, distal end, cephalic aspect. 



