94 



ILLIXOIS BIOLOGICAL MONOGRAPHS 



[264 



EXPLANATION OF PLATE 

 Mouth -PARTS 



Fig. 350. Sarcophaga haeinorrhoidaHs, lateral aspect 



/Fig. 351. Mtisca doinestica, lateral aspect. 



Fig. 352. Empis clausa, lateral aspect. 



Fig. 353. Archytas anatis, lateral aspect. 



Fig. 354- Stoinoxys calcitrans, lateral aspect. 



Fig- 355- Siphona geniculata, lateral aspect. 



Fig. 356. Conops brachyrhynchus, lateral aspect. 



Fig. 357. Scatophaga furcata, lateral aspect. 



Fig. 358. Olfersia ardcae, lateral aspect. 



Fig. 359. Stylogaster biaunulata, caudal aspect. 



Fig. 360. Sciara varians, maxillae and labium, cephalic aspect. 



Fig: 361. Exoprosopa fasciata, lateral aspect. 



Fig. 362. Hypothetical and typical labium, mesal aspect. 



Fig. 363. Hypothetical mouth-parts, lateral aspect. 



Fig. 364. Bibio femoratus, maxillae and labium, cephalic aspect. 



Fig. 364a. Eulonchus tristis, head and mouth-parts, lateral aspect. 



Fig. 365. Trichocera biwacula, maxillae and labium, cephalic aspect. 



Fig. 366. Siiiiuliuin venustum, maxillae and labium, cephalic aspect. 



Fig. 36". Rhabdophaga strobiloidcs, maxillae and labium, caudal aspect 



Fig. 368. Leia oblectabilis, maxillae and labium, cephalic aspect. 



Fig. 369. Leptis vertebrata, mesal aspect of glossa. 



Fig. 370. Leptis vertebrata, maxillae and labium, caudal aspect. 



