106 ILLINOIS BIOLOGICAL MONOGRAPHS [276 



EXPLANATION OF PLATE 



EPIPHARYNX AND HyPOPHARYNX AND ASSOCIATED PaRTS 



Rhabdophaga strobiloides, caudal aspect. 



Rhabdophaga strobiloides, lateral aspect. 



Sciara various, caudal aspect. 



Sciara varians, lateral aspect. 



Periplaneta orientalis, clypeus, labrum, and epipharynx spread out, ental 



aspect. 

 Melanoplus differcntialis, clypeus, labrum, and epipharynx spread out, 



ental aspect. 

 Gryllus pemisylvanicus, right-half of clypeus, labrum, and epipharynx. 



cephalic and caudal aspects. 

 Promachus vertebraius, lateral aspect. 



Promachus vertebraius, epipharynx and labrum, caudal aspect 

 Promachus vertebraius, caudal aspect. 

 Leptis vertebrata, lateral aspect. 

 Culicoides sanguisugus, lateral aspect 

 Bibio feinoratus, caudal aspect. 

 Bibio femoratus, lateral aspect 

 Dolichopus bifractus, caudal aspect. 

 Leptis vertebrata, caudal aspect. 

 Bibiocephala elegantula, caudal aspect. 

 Bibiocephala elegantula, lateral aspects 

 Dolichopus bifractus, lateral aspect 



