18 NOKTII AMETUCAN DIPTKRA. 



4. Fifth vein furcate. Lasiosoma Winnerlz. 



Fifth vein not furcate. .... St.egekia V. d. Wulp. 



5. Proximal end of the posterior fork (fifth vein) before or opjjosite the 



anterior cross-vein. . . . Neoemphekia Osten Sacken. 

 I'ro.xiinal end of the posterior fork beyond tiie anterior cross-vein. 



PoLVLEi'TA Winnertz. 



MYOETOPHILINiE. 



1. Three ocelli present. •> 



Only two ocelli, one situated near the margin of each eye. . . '2 



2. The costal vein is continued beyond the tip of the third vein. 



EumcKANA Loew. 

 The costal vein reaches only to the tip of the third vein. 



Mycetophii.a Meijien. 



3. The costal vein is continued beyond the tip of the third vein. . 4 

 The costal vein reaches only to the tip of the third vein. . . 11 



4. Fifth longitudinal vein not furcate, the fourth furcate. 



AcNEMiA Winnertz. 

 Fifth vein furcate. ......... 5 



5. Furcation of the fifth vein before or oj)positc the furcation of the 



fourth. ...........() 



Furcation of the fifth vein distinctly more distal than that of the fourth. 



PiiTUiNiA Winnertz. 



C>. Proboscis elongate. Gnouiste Meigcn. 



Proboscis not elongate. ........ 7 



7. Auxiliary vein connected with the first longituilinal vein by a cross- 



vein 8 



Auxiliary vein not connected with the first vein by a cross-vein. 9 



8. Ocelli of nearlj' equal size; the auxiliary vein terminates in the cross- 



vein connecting it with the first longitudinal. Svntemna Winnertz. 

 Ocelli of unequal size; the auxiliary continuous beyond the (Toss-vein, 



terminating in the costa Hoi.ktina Staeger. 



{). First basal cell very long, reaching beyond tlu' middle of the wing ; the 



beginning of the upper branidi of the forks obsolete. Leia Mi'igen. 

 First basal cell of moderate length, not reaching the middU- of the 



wing; forks comj)leti'. ........ 1<> 



10. Anterior forked cell acute ])roxinially, tiie lu'anches but littii' divergent. 



Ei'icvPTA \\'iniiertz. 

 Anterior forked ctjl less aeutt\ th(> branches strongly divergent. 



DocosiA Winnertz. 



11. Fifth longitudinal vein fm] i d «ii f' 7v<;<)mvia Winnertz. 



Fifth vi'iii not forked. 



