OF WASHINGTON. 259 



cal with Heleorfromia bistigma Curtis, according to Walker,* repeated by 

 Schiner.f ( Wiedemunma Meigen, 1838, is placed as a synonym of Min- 

 tho Desvoidy, 1830, by Schiner,J and in this he is followed by Brauer and 

 Bergenstamm.jjj 



Xiphidicera Macquart, Hist. Nat. Dipt., i, 356, 1834. ( = 

 CEdalea Meigen, 1820.) 



Type : Em pis minuta Fallen. 



Macquart described one species as new, X. rufipes, which is identical 

 with Empis minuta Fallen, according to Schiner. || 



TABLE OF THE GENERA. 



1. Third vein forked 35 



Third vein simple 2 



2. Anal cell closed far from the wing-margin, at least a portion of the 



cross vein at its apex or of the sixth vein, always present 3 



Anal cell wholly united with the axillary cell, sixth vein wholly want 

 ing, discal cell always united with one of the other cells 29 



Anal cell open to the wing-margin, second vein terminating in the 

 first, three veins issuing from apex of the discal cell, 



Mythicomyia Coq. 



3. Discal cell complete 4 



Discal cell united with one of the other cells 23 



4. Second posterior cell sessile 5 



Second posterior cell long-petiolate, proboscis very short, 



Meghyperus Loew. 



5. With three veins issuing from apex of the discal cell n 



With only two veins issuing from apex of this cell 6 



6. Lower outer angle of anal cell acute, this cell at least as long as the 



second basal 8 



Lower outer angle of anal cell obtuse, this cell shorter than the 

 second basal 7 



7. Arista apical, third joint of antennae conical Leptopeza Macq. 



Arista subdorsal, third joint of antennae oval Ocydromia Meig. 



8 Origin of second vein midway between the small and the humeral 



crossveins, or nearer to the former 9 



Origin nearer to the humeral than to the small crossvein, 



Acromyia Latr. 



9. Vein between basal cells distinct 10 



Vein between these cells obsolete Syndyas Loew. 



10. Eyes widely separated below the antennae, proboscis elongated, 



Hybos Meig. 

 Eyes contiguous below the antennas, proboscis short... .Euhybus Coq. 



*Ins. Brit., Dipt , i, 107. 



fFaun Aus., Dipt., i, 84. 



% Faun. Aus., Dipt., i. 556. 



Zweifl. Kais. Mus. Wien, v. 426. 



|| Faun. Aus., Dipt., i, 81. 



