100 ILLINOIS BIOLOGICAL MONOGRAPHS [270 



EXPLANATION OF PLATE 

 Labium 



Fig. 430. Chloropisca glabra, caudal aspect. 



Fig. 431. Chlorofisca glabra, cephalic aspect. 



Fig. 432. Dolichopus bifractus, mesal aspect. 



Fig. 433. Dolichopus bifractus, caudal aspect. 



Fig. 434. Dolichopus bifractus. lateral aspect. 



F'g- 435- Pipunculus cingulatus, caudal aspect. 



Fig. 436. Pipunculus cingulatus, cephalic aspect. 



Fig- 437- Borborus cquinus, caudal aspect. 



Fig. 438. Borborus equinus, mesal aspect. 



Fig. 439. Sepsis violacea, caudal aspect. 



Fig. 440. Sepsis violacea, mesal aspect. 



Fig. 441. Eristalis tenax, mesa! aspect. 



Fig. 442. Eristalis tenax, caudal view. 



Fig. 443. Eristalis tenax, distal end of theca, caudal aspect. 



Fig. 444. Ochthera mantis, caudal aspect. 



Fig. 445. Ochthera mantis, mesal aspect. 



Fig. 446. Calobata univitta, mesal aspect. 



Fig. 447. Calobata univitta, caudal aspect. 



Fig. 448. Coelopa vanduzcii, caudal aspect. 



Fig. 449. Coelopa vandu:cii, mesal aspect. 



Fig. 450. Sphyracephala brcvicornis, caudal aspect. 



Fig. 4SI. Sphyracephala brevicornis, mesal aspect. 



Fig. 452. Oecothea fenestralis, caudal aspect. 



Fig. 453. Oecothea fenestralis, mesal aspect. 



Fig. 454. Drosophila ampclophila, caudal aspect. 



Fig. 455. Drosophila ampclophila, mesal aspect. 



Fig. 456. Chrysomyca demandata, mesal aspect. 



Fig. 457. Chrysomyca demandata, caudal aspect. 



Fig. 458. Siphona geniculata, distal end, cephalic aspect. 



