LIST OF DIPTERA. 507 



striped with black ; middle shanks piceous ; hind thighs and tips of 

 hind shanks black : wings brown ; wing-ribs and veins piceous ; 

 poisers tawny. Length of the body If line ; of the wings 2 lines. 



a. St. Martin's Falls, Albany Biver, Hudson's Bay. Presented by 

 G. Barnston, Esq. 



Tachydromia maculipennis, Barnstoris MSS.> mas. Nigra, an- 

 tennis nigris, pedibus piceis, alis sublimpidis, fusco bimaculatis 

 basi albis. 



Body black, shining : eyes piceous : feelers and mouth black : 

 legs piceous : wings nearly colourless, white at the base, each with 

 a large brown spot on the fore border at two-thirds of the length from 

 the base ; wing-ribs and veins piceous, the latter yellow towards the 

 base. Length of the body If line ; of the wings lj line. 



a. St. Martin's Falls, Albany Kiver, Hudson's Bay. Presented by 

 G. Barnston, Esq. 



Group II. 



Tachydeomia arenaria. Tachypeza arenaria, Hal. Ent. Mag. i. 



161. Walk. Ent. Mag. iii. 180. Tachydromia brevipennis ? 



Zett. Ins. Lapp. 548, 8. 

 a. England. Presented by F. Walker, Esq. 



Tachydeomia graminum, Fall, Empid. 15,21. Meig. Dipt. iii. 



72, 10. Tachypeza graminum, Hal. Ent. Mag. i. 161. Walk. 



Ent. Mag. iii. 180. 

 a. England. Presented by F. Walker, Esq. 



Platypalpus, Macquart. 



Platypalpus longicornis. Tachydromia longicornis, Meig. Dipt. 



iii. 73, 12. 

 a. England. Presented by F. Walker, Esq. 



Platypalpus nigritarsis. Tachydromia nigritarsis, Fall. Empid. 



34, 1, 2. Meig. Dipt. iii. 13. 

 a. Alten, Finmark. Presented by F. Walker, Esq. 



Platypalpus pallipes. Tachydromia pallipes, Fall. Empid. 8, 6. 



Meig. Dipt. iii. 74, 14. Zett. Ins. Lapp. 553, 16 ? 

 ia. France. 



