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. 

 Simulium venustum, female, caudal aspect 

 Trichoeera bimacula, lateral aspect. 

 Trichocera biiitacula, caudal aspect. 

 Dixa clavata, lateral aspect. 

 Dixa clavata, caudal aspect. 

 Tipula bicomis, lateral aspect. 

 Psorophora ciliata, female, lateral aspect. 

 Psorophora ciliata, female, caudal aspect 

 Geranomyia canadensis, lateral aspect. 

 Limnobia innnatura, lateral aspect. 

 Rhyphus punctatus, lateral aspect. 

 Rhyphus punctatus, caudal aspect 



