LIPOXEURIDJE. 19 



12. Auxiliary vein very long, terminating in the costa. 



NEOGLAPHYROITERA Osten Sacken. 

 Auxiliary vein short, or, if long, ending in the first vein. . . 13 



13. Furcation of the fifth vein opposite or before the anterior cross- vein, 



and more proximal than that of the fourth vein. . . ' . 14 



Furcation of the fifth vein more distal than the anterior cross-vein or 



the furcation of the fourth vein. ...... 15 



14. Auxiliary vein reaching beyond the middle of the first basal cell. 



TRICHONTA Winnertz. 



Auxiliary vein sometimes rudimentary, or not reaching to the middle 

 of the first basal cell 16 



15. Furcation of the fourth vein opposite or before the first section of the 



third vein; posterior forked cell long and narrow. 



RHYMOSIA Winnertz. 

 Furcation beyond the first section of the third vein. ALLOHIA Winnertz. 



16. Posterior forked cell narrow. . . . MYCOTHERA Winnertz. 

 Posterior forked cell broad, the branches divergent. EXECHIA Winnertz. 



3. LIPONEURID.E. 



Moderate sized, elongate, bare species with broad wings and 

 long legs. Both sexes holoptic or dichoptic ; three ocelli pres- 

 ent; proboscis elongated ; antennae slender, composed of from 

 six to sixteen joints, clothed with short pubescence. Thorax 

 with a distinct, broadly interrupted, transverse suture. Hypo- 

 pygium projecting; ovipositor with two short, rather obtuse, 

 lamella. Legs moderately slender, the hind pair much longer 

 than the anterior ones. Em podium very small, almost rudi- 

 mentary ; pulvilli wanting ; wings broad, bare, with a mark- 

 edly projecting anal angle; peculiarly characterized from all 

 other flies by a secondary, extremely tine, spider-like network. 



The family Blepharoceridae or Liponeuridae was established 

 by Loew in 1860 to include a half dozen species, which could 

 not well be located in any of the existing families. Since that 

 time the number in the family has been increased to about sev- 

 enteen known forms, distributed in nine genera. Six of these 

 species are found in Europe, one in Asia, six in North America, 

 one in the West Indies, and three in South America. The 



