108 ILLINOIS BIOLOGICAL MONOGRAPHS [278 



EXPLANATION OF PLATE 

 Epipharynx and Hypopharynx and x\ssociated Parts 



Fig. 529. Psychoda albipennis, lateral aspect. 



Fig. 530. Psychoda albipennis, caudal aspect. 



Fig. 531. Chironomus ferrngincovittatus, lateral aspect. 



Fig. 532. Chironomas ferrugineovittatus, caudal aspect. 



Fig. 533. Psilocephala haemorrhoidalis, lateral aspect. 



Fig. 534. Psilocephala haemorrhoidalis, caudal aspect. 



Fig. 535- Mydas clavatns, lateral aspect. 



Fig. 536. Mydas clavatus, caudal aspect. 



Fig. 53". Scenopinus fenestralis, caudal aspect. 



Fig. 538. Scenopinus fenestralis, lateral aspect. 



Fig. 539- Lonchoptcra lutea, lateral aspect. 



Fig. 540. Aphiochaeta agarici, caudal aspect. 



Fig. 541. Lonchoptera lutea, caudal aspect. 



Fig. 542. Platypcza vclutina, caudal aspect. 



Fig. 542a. Platypcza vclutina, 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. Empis clausa, lateral aspect. 



Fig. 548. Empis clausa, caudal aspect. 



Fig. 549. Exoprosopa fasciata, lateral aspect. 



Fig. 550. Exoprosopa fasciata, caudal aspect. 



