112 ILLINOIS BIOLOGICAL MONOGRAPHS [282 



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EXPLANATION OF PLATE 



Epipharynx and Hypopharynx and Associated Parts 



Fig. 580. Occothea fenestralis, lateral aspect. 



Fig. 581. Oecothea fenestralis, caudal aspect. 



Fig. 582. Sepsis violacea, lateral aspect. 



F'g- 583- Sepsis violacea, caudal aspect. 



Fig. 584. Tetanocera plumosa, lateral aspect. 



Fig. 585. Sphyracephala hrevicornis, lateral aspect. 



Fig. 586. Tetanocera plumosa, caudal aspect. 



Fig. 587. Eristalis tenax, caudal aspect. 



Fig. 588. Eristalis tenax, lateral aspect. 



Fig. 589. Heteroneura fiaviseta, lateral aspect. 



Fig. SQO. Heteroneura fiaviseta, caudal aspect. 



Fig. 591. Conops hrachyrhynchus, caudal aspect. 



Fig. 592. Conops hrachyrhynchus, lateral aspect. 



Fig. 593. Scatophaga furcata, lateral aspect. 



Fig. 594. Scatophaga furcata, caudal aspect. 



Fig. 595. Thelaira lexicosona, 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. 



l/Fig. 600. Musca doinestica, 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. Olfcrsia ardeae, lateral aspect. 



