316 



The Two-winged Flies 



\ 



FIG. 433. FIG. 434. 



FIG. 433. Net-winged midge, Bibiocephala elegantulus, female. (Natural length of 

 body, f inch.) 



FIG. 434. Mouth-parts of female net-winged midge, Bibiocephala doanei. l.ep., labrum- 

 epipharynx; md., mandible; mx., maxilla; mxl., maxillary lobe; mxp., maxillary 

 palpus; li., labium; pg., paraglossa; hyp., hypopharynx. (Much enlarged.) 



FIG. 435. Heads of female (at left) and of male (at right) of net-winged midge, Bibio- 

 cephala comstocki, showing division of eyes into two parts, the upper part with fewer 

 and larger facets than the lower part. (Much enlarged.) 



