104 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[274 



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EXPLANATION OF PLATE 



EpfPHARYNX AND HyPOPHARYNX AND ASSOCIATED PARTS 



Hypothetical type, lateral aspect. 

 Tabanus giganteus, female, lateral aspect. 

 Tabanus giganteus, male, lateral aspect. 

 Tabanus giganteus, female, caudal aspect. 

 Simulium venustum, female, lateral aspect. 

 Siiiiuliuti! venustum, female, caudal aspect. 

 Trichoccra biniacida, lateral aspect. 

 Trichoccra biiiiacula, caudal aspect. 

 Dixa clavata, lateral aspect. 

 Dixa clavata, caudal aspect. 

 Tipula bicornis, lateral aspect. 

 Psorophora ciliata, female, lateral aspect. 

 Psorophora ciliata, female, caudal aspect. 

 Geranomyia canadensis, lateral aspect. 

 Livinobia inuitatura, lateral aspect. 

 Rhyphus punctatus, lateral aspect. 

 Rhyphus punctatus. caudal aspect. 



