106 ILLINOIS BIOLOGICAL MONOGRAPHS [276 



EXPLANATION OF PLATE 



Epipharynx and Hyfopharynx and Associated Parts 



Fig. 510. Rhabdophaga strohiloides, caudal aspect. 



Fig. 511. Rhabdophaga strobiloides, lateral aspect. 



Fig. 512. Sciara varians, caudal aspect. 



Fig. 513. Sciara varians, lateral aspect. 



Fig. 514. Pcriplaneta oricntalis, clypeiis, labrum, and epipharynx spread out, enta! 



aspect. 



Fig. 515. Melanoplus diffcrentialis, clypeus, labrum. and epipharynx spread out, 



ental aspect. 



Fig. 516. Gryllus pennsylvanicus, right-half of clypeus, labrum, and epipharynx, 



cephalic and caudal aspects. 



Fig. 517. Proiiiachus vcrtebratus, lateral aspect. 



Fig. 518. Promachus vcrtebratus, epipharynx and labrum, caudal aspect. 



Fig. 519. Promachus vcrtebratus, caudal aspect. 



Fig. 520. Leptis vertcbrata, lateral aspect. 



Fig. 521. Culicoides sanguisugus, lateral aspect. 



Fig. 522. Bibio fciiwratus, caudal aspect. 



Fig- 523. Bibio femoratus, lateral aspect. 



Fig. 524. Dolichopus bifractus, caudal aspect. 



Fig. 525. Leptis vertcbrata, caudal aspect. 



Fig. 526. Bibioccphala clcgantula. caudal aspect. 



Fig. 527. Bibioccphala clcgantula, lateral aspect. 



Fig. 528. Dolichopus bifractus, lateral aspect. 



