112 ILLINOIS BIOLOGICAL MONOGRAPHS [282 



EXPLANATION OF PLATE 

 Epipharynx and Hypopharyxx and Associated Parts 



Fig. 580. Occothca fenestralis, lateral aspect. 



Fig. 581. Oecothca fenestralis, caudal aspect. 



Fig. 582. Sepsis violacea, lateral aspect. 



Fig. 583. Sepsis violacea, caudal aspect. 



Fig. 584. Tetanocera pluinosa, 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. Hetcroneura flaviseta, lateral aspect. 



Fig. 590. Hcteroneura flaviseta, caudal aspect. 



Fig. 591. Conops brachyrhynchiis, caudal aspect. 



Fig. 592. Conops bracliyrJiynchns, lateral aspect. 



Fig. 593. Scatophaga furcata, lateral aspect. 



Fig. 594. Scatophaga furcata, caudal aspect. 



Fig. 595. Thelaira leucosona, lateral aspect. 



Fig. 596. Thelaira leucosona, caudal aspect. 



Fig- 597- Hydrotaea dentipcs, lateral aspect. 



Fig. 598. Hydrotaea dentipes, caudal aspect. 



Fig. 599. Stomoxys calcifrans, lateral aspect. 



Fig. 600. Musca domestica, lateral aspect. 



Fig. 601. Musca domestica, caudal aspect. 



Fig. 602. Sarcophaga hacmorrhoidalis, 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. 



