96 ILUXOIS lilOLOCICAL MOXOCRAPHS [266 



EXPLANATION OF PLATE . 

 Maxillae and Labium 



Chirononnis fcrriiyineovittatus, cephalic aspect. 



Psyclioda albi/'cnins, cephalic aspect. 



Psoro/'liora ciliata, female, portions of mandibles, maxillae, labium, ten- 

 torium, and head-capsule. 



Rhyphus puiictatus, cephalic aspect. 



Di.va davata, cephalic aspect. 



Proinachus vertcbratus, caudal aspect. 



Proiiiachus vcrtehratus, labium, ceplialic aspect. 



Proinachus vcrtehratus, cross-section of labium, see figure 377. 



Proinachus vcrtehratus, distal end of labium, cephalic aspect. 

 Fig. 380. Psorophora ciliata, distal end of labium, caudal aspect. 

 Fig. 381. Psorophora ciliata, distal end of labium, cephalic aspect. 

 Fig. 382. Geranoinyia canadensis, cephalic aspect. 

 Fig. 383. Tipula bicornis, distal end of labium, mesal aspect. 

 Fig. 384. Tipula bicornis, caudal aspect of labium. 

 Fig. 385. Hclobia punctipennis, caudal aspect. 

 Fig. 386. Limnobia innnatura, caudal aspect. 

 Fig. 387. Dixa clavala. caudal aspect of labium. 



Fig. 388. Tipula bicornis, sclerites about distal end of theca of labium. 

 Fig. 389. Bittacomorpha clavipcs, distal end of labium, mesal aspect. 

 Fig. 390. Tabanus gigantcus, mesal aspect of labium. 

 Fig. 391. Tabanus giganteus, caudal aspect of labium. 

 Fig. 392. Tabanus giganteus, cephalic aspect of labium. 

 Fig. 393. Aphiochacta agarici, caudal aspect. 

 Fig. 394. Aphiochacta agarici, distal end of labium, mesal aspect. 



