446 



NEMESTRINID.E 



7 (8) Cubital fork long and simple; anal cell open (fig. 251). 



Hermoneura. 



Sometimes there is an adventitious cross-vein near the end of the 

 mediastinal vein connecting that with the subcostal vein. 



8 (7) Cubital fork with both branches running into the radial vein and 



forming a closed cell above the " diagonal vein " ; anal cell closed 

 at the wingmargin (fig. 255). Symmictus. 



Fig. 255. — Buth wings of ihe type specimen of Dicrotrypana flavopilosa Bigot, x (5g. 



Loew endeavoured to distinguish Ehynchocephcdus and Nemcstrina in 

 the Ncmcstrinidce, and Hermoneura and Syminietus in the Hcrmoneurinm 

 by characters derived from the joints of the style and palpi. 



