108 ILLINOIS BIOLOGICAL MONOGRAPHS [278 



EXPLANATION OF PLATE 

 Epipharynx and Hypopharynx and Associated Parts 



Fig. 529. Psychoda alhipennis, lateral aspect. 



Fig. 530. Psychoda albipennis, caudal aspect. 



Fig. 531. CJiironoiiius fcrrugincovittatus, lateral aspect. 



Fig. 532. CliironoDitis fcrrngincovittatus, caudal aspect. 



Fig. 533. Psilocephala hacmorrhoidalis, lateral aspect. 



Fig- 534- Psilocephala hacmorrhoidalis, caudal aspect. 



Fig. 535. Mydas clavatus, lateral aspect. 



Fig. 536. Mydas clavatus, caudal aspect. 



Fig. 537. Scenopinus fenestralis, caudal aspect. 



Fig. 538. Scenopinus fenestralis, lateral aspect. 



Fig. 539. Lonchoptera liitea, lateral aspect. 



Fig. 540. Aphiochaeta agarici, caudal aspect. 



Fig. 541. Lonchoptera lutea, caudal aspect. 



Fig. 542. Platypcza velutina, caudal aspect. 



Fig. 542a. Platypeca velutina, lateral aspect. 



Fig. 543. Eulonchus tristis, lateral aspect. 



Fig. 544. Aphiochaeta agarici, lateral aspect. 



Fig. 545. Stratiomyia apicula, lateral aspect. 



Fig. 546. Stratiomyia apicula, caudal aspect. 



Fig. 547. Enipis clausa, lateral aspect. 



Fig. 548. Empis clausa, caudal aspect. 



Fig. 549. Exoprosopa fasciata, lateral aspect. 



Fig. 550. Exoprosopa fasciata, caudal aspect. 



