86 ILLISOIS BIOLOGICAL MONOGRAPHS [2S& 



EXPLAN'ATION OF PLATE 



Mandible and Maxillae 



Fig. 256I1. Hypothetical mandible. 

 Fig. 257. Hypothetical maxillae. 



Siiniiliuin venustuiii, female, cephalic aspect. 



Tabaitus giganteus, female, caudal aspect. 



Trichoccra bimanda, caudal aspect. 



Rliyphus punctatus, caudal aspect. 



Di.v(i clavata, caudal aspect. 



Psychoda albipennis, caudal aspect 



Bibio fenwratus, caudal aspect. 



CuUcoidc's satiguisugus, female, caudal aspect. 



Psorophora ciliata, female and male, caudal aspect. 



Sciara varians, caudal aspect. 



Rhabdophaga strobiloidcs, caudal aspect. 



Bibiocephala eleganiula, female, caudal aspect. 



Chironomus ferriigiveovittatus, cephalic aspect. 



Mydas clavatus, lateral aspect. 



Platypeza veluiina, lateral a^spect. 



Stratioiiiyia apicuhi, cephalic aspect. 



Einpis clausa. lateral aspect. 



Lcptis vertebrata, caudal aspect. 



Promachus vcrtebratus, caudal aspect. 



Tipula bicoriiis, portion of caudal aspect. 



Aphiochaeta agarici, lateral aspect. 



Pipunculus cingulatus, lateral aspect. 



Lonchoptera lutea. 



Psiloccphala haenwrrhoidalis, cephalic aspect. 



Scenopinits fenestralis. 



Tabaiius giganteus, male, caudal aspect. 



Dolichopus bifractus. 



