94 



ILLINOIS BIOLOGICAL MOXOGRAPHS 



[264 



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EXPLANATION OF PLATE 

 Mouth-parts 



Sarcopliaga haetiwrrhoidalis, lateral aspect. 



Miisca doinestica, lateral aspect. 



Euipis clausa, lateral aspect. 



Archytas analis, lateral aspect. 



Stoiiioxys calcitrans, lateral aspect. 



Siphona gcnicidata, lateral aspect. 



Coiiops hrachyrliynchiis, lateral aspect. 



Scatophaga furcata, lateral aspect. 



Olfersia ardeae, lateral aspect. 



Stylogaster biannulata, caudal aspect. 



Sciara varians, maxillae and labium, cephalic aspect. 



Exoprosopa fasciata, lateral aspect. 



Hypothetical and typical labium, mesal aspect. 



Hypothetical mouth-parts, lateral aspect. 



Bibio feinoratus, maxillae and labium, cephalic aspect. 



Eulonchus tristis, head and mouth-parts, lateral aspect. 



Trichocera bimacula, maxillae and labium, cephalic aspect. 



Sinmlium venustum, maxillae and labium, cephalic aspect. 



Rhabdophaga strobiloidcs, maxillae and labium, caudal aspect 



Leia oblcctabilis, maxillae and labium, cephalic aspect. 



Leptis vertebrata, mesal aspect of glossa. 



Leptis vertebrata, maxillae and labium, caudal aspect. 



