96 



ILLIXOIS BIOLOGICAL MOXOGRAPHS 



[266 



EXPLANATION OF PLATE 



Maxillae and Labium 



CliironoJiius fcrrugincoiittatus, cephalic aspect. 

 Psychodit albipcnnis, cephalic aspect. 



Psoroplwra cilicita, female, portions of mandibles, maxillae, labium, ten- 

 torium, and head-capsule. 

 Rhyphus punctatiis, cephalic aspect. 

 Dixa clavata, cephalic aspect. 

 Promachus vcrtcbratus, caudal aspect. 

 Prouiachtis vertebratus, labium, cephalic aspect. 

 Promachus vertebratus, cross-section of labium, see figure 377. 

 Promachus vertebratus. distal end of labium, cephalic aspect. 

 Psorophora ciliata. distal end of labium, caudal aspect. 

 Psorophora ciliata, distal end of labium, cephalic aspect. 

 Geranomyia canadensis, cephalic aspect. 

 Tipula bicornis, distal end of labium, mesal aspect. 

 Tipiila bicornis, caudal aspect of labium. 

 Hclobia punctipcnnis, caudal aspect. 

 Liiimobia iinmattira, caudal aspect. 

 Dixa clavata, caudal aspect of labium. 



Tipula bicornis, sclerites about distal end of theca of labium. 

 Bittacomorpha clavipcs, distal end of labium, mesal aspect. 

 Tabanus giganteus, mesal aspect of labium. 

 Tabanus giganteus, caudal aspect of labium. 

 Tabanus giganteus, cephalic aspect of labium. 

 Aphiochaeta agarici, caudal aspect. 

 Aphiochaeta agarici, distal end of labium, mesal aspect. 



