98 



ILLIXOIS BIOLOGICAL MONOGRAPHS 



[268: 



EXPLANATION OF PLATE 



Labium 



Stratioiuyia apicula, caudal aspect of proboscis. 



Stratiomyia apicula, mesal aspect. 



Mydas clavatus, caudal aspect. 



Mydas clavaius, cephalic aspect. 



Bibiocephala elcgantiila, cephalic aspect. 



Sccnopinus fenestralis, mesal aspect. 



Scenopinus fenestralis, caudal aspect. 



Psilocephala hacniorrhoidalis, caudal aspect. 



Psiloccphala haeiiiorrhoidalis, mesal aspect. 



Desiiioiiietopa latipes, caudal aspect. 



Dcsnwtiietopa latipes, cephalic aspect. 



Lonchoptera liitca, caudal aspect. 



Louchoptera liitca, cephalic aspect. 



Lonchoptera liitca, mesal aspect. 



Saproniyca vulgaris, caudal aspect. 



Saproiny::a vulgaris, mesal aspect. 



Chyroniya concolor, caudal aspect. 



CJiyroniya concolor, mesal aspect. 



Euaresta aequalis, caudal aspect. 



Euaresta aequalis, mesal aspect. 



Platypeza velutina, mesal aspect. 



Platypcza velutina, caudal aspect. 



Conops brachyrhynclius. distal end, caudal aspect. 



Conops brachyrhynchus, distal end, lateral aspect. 



Conops brachyrhynchus, distal end. cephalic aspect. 



Conops brachyrhynchus, caudal aspect. 



Enipis clausa, caudal aspect. 



Einpis clausa, portion of cephalic aspect. 



Eiiipis clausa, cephalic aspect. 



Rhaniphoniyia glabra, caudal aspect. 



Rhainphoinyia glabra, mesal aspect. 



Eulonchus tristis, cephalic aspect. 



Eulonchus tristis, distal end, mesal aspect. 



Exoprosopa fasciata, distal end, caudal aspect. 



Exoprosopa fasciata, cephalic aspect. 



Exoprosopa fasciata, distal end, mesal aspect. 



Exoprosopa fasciata, caudal aspect. 



N. 



