112 ILLINOIS BIOLOGICAL MONOGRAPHS [282 



EXPLANATION OF PLATE 

 Epipharynx and Hypopharynx and Associated Parts 



Fig. 580. Oecothea fenestralis, lateral aspect. 



Fig. 581. Oecothea fenestralis, caudal aspect. 



Fig. 582. Sepsis violacea, lateral aspect. 



Fig. 583. Sepsis violacea, caudal aspect. 



Fig. 584. Tetanocera plumosa, lateral aspect. 



Fig. 585. Sphyracephala brevicornis, lateral aspect. 



Fig. 586. Tetanocera plumosa, caudal aspect. 



Fig. 587. Eristalis tenax, caudal aspect. 



Fig. 588. Eristalis tenax, lateral aspect. 



Fig. 589. Heteronenra flaviseta, lateral aspect. 



Fig. 590. Heteronenra flaviseta, caudal aspect. 



Fig. 591. Conops brachyrhynchns, caudal aspect. 



Fig. 592. Conops brachyrhynchns, lateral aspect. 



Fig. 593. Scatophaga furcata, lateral aspect. 



Fig. 594. Scatophaga furcata, caudal aspect. 



Fig. 595. Thelaira leucozona, lateral aspect. 



Fig. 596. Thelaira leucozona, caudal aspect. 



Fig. 597. Hydrotaea dentipes, lateral aspect. 



Fig. 598. Hydrotaea dentipes, caudal aspect. 



Fig. 599. Stomoxys calcitrans, lateral aspect. 



Fig. 600. Musca domestica, lateral aspect. 



Fig. 601. Musca domestica, caudal aspect. 



Fig. 602. Sarcophaga haemorrhoidalis, lateral aspect. 



Fig. 603. Sarcophaga haemorrhoidalis , caudal aspect. 



Fig. 604. Archytas analis, lateral aspect. 



Fig. 605. Archytas analis, caudal aspect. 



Fig. 606. Olfersia ardeae, lateral aspect. 



