108 ILLINOIS BIOLOGICAL MOXOGRAPHS [278 



EXPLANATION OF PLATE 

 Epipharynx and Hypopharynx and Associated Parts 



Fig. 529. Psychoda albitcitiiis, lateral aspect. 



Fig. 530. Psychoda albipcunis, caudal aspect. 



Fig. 531. Chironoimis fcrrugincoziltatiis, lateral aspect. 



Fig. 532. Cliiroiwmus ferrugincorittatus, caudal aspect. 



Fig. 533. Psilocephala haemorrhoidalis, lateral aspect. 



Fig. 534. Psilocephala haemorrhoidalis, caudal aspect. 



Fig. 535. Mydas clavaius, lateral aspect. 



Fig. 536. Mydas clavatus, caudal aspect. 



Fig. 537- Scenopinus fcncstralis, caudal aspect. 



Fig. 538. Scenopinus fencstralis, lateral aspect. 



Fig. 539. Lonchoptera lutea, lateral aspect. 



Fig. 540. Aphiochaeta agarici, caudal aspect. 



Fig. S41. Lonchoptera lutea, caudal aspect. 



Fig. 542, Platypesa vchitina, caudal aspect. 



Fig. 542a. Platypc:a vclutina. lateral aspect. 



Fig. S43. Eidonchus tristis, lateral aspect. 



Fig. S44- Aphiochaeta agarici, lateral aspect. 



Fig. 545. Stratiomyia apicula, lateral aspect. 



Fig. 546. Stratiomyia apicula, caudal aspect. 



Fig. 547. Em pis clausa, lateral aspect. 



Fig. 548. Empis clausa, caudal aspect. 



Fig. 549. Exoprosopa fasciata, lateral aspect. 



Fig. 550. Exoprosopa fasciata. caudal aspect. 



