100 ILLIXOIS BIOLOGICAL MOSOGRAPHS [270 



EXPLANATION OF PLATE 

 Labium 



Fig. 430. Ckloropisca glabra, caudal aspect . '' 



' Fig. 431. Ckloropisca glabra, cephalic aspect. 



Fig. 432. Dolichopus bifractus, mesal aspect. 



Fig. 433. Dolichopus bifractus, caudal aspect 



Fig. 434. Dolichopus bifractus. lateral aspect 



Fig. 435. Pipunculus cingulatus, caudal aspect 



Fig. 436. Pipunculus cingulatus, cephalic aspect 



Fig. 437. Borborus equinus, caudal aspect. 



Fig. 438. Borborus equinus, mesal aspect 



Fig. 439. Sepsis violacea, caudal aspect. 



Fig. 440. Sepsis I'iolacea, mesal aspect 



' '" - Fig. 441. Eristalis tenax, mesal 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 uniz-itta, caudal aspect. 



Fig. 448. Coelopa vanduzeii, caudal aspect. 



Fig. 449. Coelopa vanduzeii, mesal aspect 



Fig. 450. Sphyracephala brevicornis, caudal aspect 



Fig. 451. Sphyracephala brevicornis, mesal aspect. 



Fig. 452. Oecothea fenestralis, caudal aspect 



" Fig. 453. Oecothea fenestralis, mesal aspect 



Fig. 454. Drosophila ampelophila, caudal aspect 



Fig. 455. Drosophila ampelophila, mesal aspect. 



Fig. 456. Chrysomyza demandata, mesal aspect. 



F'K- 457- Chrysomyza demandata, caudal aspect 



\7'^ Fig. 458. Siphona geniculata, distal end, cephalic aspect 



