NEMESTRINID.5: 



445 



This pseudo-vein is very conspicuous, and there is no equivalent vein existing 

 in any other family of diptera. 



Other peculiarities worthy of notice exist in the long (and sometimes compli- 

 cated) fork of the cubital vein, the long narrow anal cell, the undulated anal vein, 

 and the rather short prtefurca which may commence not much before the base of 

 the discal cell but still before the middle of the upper basal cell. 



Tahle of the Palceantic Suhfamilics and Genera. 



1 (6) Proboscis very long ; palpi short. Nemestkinin^. 



2 (3) Branches of the cubital vein reuniting and forming an almost 



triangular cell above the end of the discal cell ; wing-tip and 



Fig. 252. — Fallcnia Jasdata i. x 6. 



hindmargin without any outgoing veins except from the end of the 



closed anal cell (fig. 252). Fallenia. 



The veins near the wing-tip vary, as the terminal portion of the 

 cubital vein may be joined before the wingmargin by the radial vein or 

 by the lower branch of the discal vein. 



3 (2) Branches of the cubital vein long and running almost parallel to 

 the posterior wingmargin near the wing-tip ; " diagonal vein " 

 often continued to the wingmargin. 



Fig. ^hZ.—RhynchocepTialv.s Tauscheri. x 5. 



4 (5) " Diagonal vein " not extended to the wingmargin (fig. 253). 



Ehynchocephalus. 



5 (4) "Diagonal vein" extended to the wingmargin (figs. 250, 254). 



Nemestrina. 



X 7. 



Fig. 254. — Nemestrina albofasciata $ . 



6 (1) Proboscis very short ; palpi very long and upturned 



Hermoneurin^. 



