TABLE FOR DETERMINING THE GENERA. 47 



f Wings conspicuously hairy on the whole surface or along the 



veins. 26 



25 -i 



j Wings not conspicuously hairy on the surface, veins glabrous, or 



almost so. 27 



f Wings conspicuously hairy on the whole surface. 



Gen. XVI. Rhypholophus. 

 2fi 1 



j Wings conspicuously hairy along the veins and not in the cells. 



Gen. XVII. Erioptera. 



fThe first submarginal cell is remarkably short, half as long as the 



second or less ; Tab. II, fig. 2, 4. 28 



21 \ 



I 



29 



30 { 



The first submarginal cell is much longer than half the length of the 

 second. 29 



( Marginal cross-vein wanting. Gen. XXIII. Goniomyia. 



( Marginal cross-vein present. Gen. XXIV. Empeda. 



'The distance between the subcostal cross-vein and the tip of the 

 auxiliary vein is more than twice the length of the great 

 cross-vein. 30 



The distance between the subcostal cross-vein and the tip of the 

 auxiliary vein is moderate or small (usually not more than the 

 length of the great cross-vein) . 31 



f Seventh longitudinal vein straight; Tab. II, fig. 1. 



Gen. XVIII. Trimicra. 

 Seventh longitudinal vein conspicuously bisinuated ; Tab. I, fig. 20. 



Gen. XX. Symplecta. 

 / Body uniformly black. Gen. XXI. Gnophomyia. 



31 < Body black, scutellum and pleuras marked with yellow. 1 



v. Gen. XXII. Psiloconopa. 



Section IV. Limnophilina. 



q 2 ( Wings pubescent. Gen. XXIX. Ulomorpha. 



( Wings glabrous. 33 



( Seventh longitudinal vein very short, abruptly incurved towards the 



33 1 anal angle ; Tab. II, fig. 13. Gen. XXX. Trichocera. 



' The seventh longitudinal vein follows the ordinary course. 34 



(A supernumerary cross-vein between the auxiliary vein and the 



I costa. Gen. XXVII. Epiphragma. 



' j No supernumerary cross-vein between the auxiliary vein and the 



costa. Gen. XXVIII. Limnophila. 



Section V. Anisomerina. 



or ( Three posterior cells. 36 



' Four or five posterior cells. 37 



1 I am not sufficiently acquainted with the European genus Psiloconopa 

 to distinguish it from Gnophomyia in a satisfactory manner ; the distinction 

 given here is merely empirical. (Compare their descriptions below.) 



