106 ILLINOIS BIOLOGICAL MONOGRAPHS [276 



EXPLANATION OF PLATE 

 Epipharyxx and Hypopharynx 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. Periplaneta orientalis, clypeus, labrum, and epipharynx spread out, ental 



aspect. 



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



ental aspect. 



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



cephalic and caudal aspects. 



Fig. 517. Proiiiachns vertebratus, lateral aspect. 



Fig. S18. Promachiis vertebratus, epipharynx and labrum, caudal aspect. 



Fig. 519. Promachus vertebratus, caudal aspect. 



Fig. 520. Leptis vertebrata, lateral aspect. 



Fig. 521. Culicoides sanguisugus, lateral aspect. 



Fig. 522. Bibio femoratus, caudal aspect. 



Fig. 523. 'Bibio femoratus, lateral aspect. 



Fig. 524. Dolichopus bifractus, caudal aspect. 



Fig. 525. Leptis vertebrata, caudal aspect. 



Fig. 526. Bibiocephala elegantula, caudal aspect. 



Fig. 527. Bibiocephala elegantula, lateral aspect. 



Fig. 528. Dolichopus bifractus, lateral aspect. 



