LIST OF DIPTERA. 557 



wings slightly gray; wing-ribs piceous; veins black, ferruginous 

 towards the base ; poisers tawny. Length of the body 4J- lines ; of 

 the wings 9 lines. 



a. Trenton Falls. Presented by E. Doubleday, Esq. 



Xylota flavifrons, Barnstoris MSS., mas. et fem. Nigro-cenea, 

 abdominis lateribus chalybeo maculatis, antennis ferrugineis, 

 pedibus nigro-ceneis, tibiis tarsisque nonnunquam fulvis, alis 

 subfuscis. 



Male. — Body black, clothed with short tawny hairs : head as 

 broad as the chest, covered with hoary bloom, clothed behind and 

 beneath with short white hairs, beset behind and on the crown with 

 longer black hairs : eyes dark red ; facets small ; mouth black ; 

 feelers dark ferruginous, black at the base : abdomen linear, a little 

 narrower than the chest, and full thrice its length ; segments 

 adorned with large steel-blue spots on each side : legs brassy black, 

 clothed with short tawny hairs ; shanks and feet black, tawny at 

 the base ; foot-cushions tawny : wings slightly brown ; wing-ribs 

 and veins black, the latter ferruginous towards the base ; poisers 

 yellow. Female. — Shanks and feet black; knees ferruginous. 

 Length of the body 4 — 5 lines ; of the wings 7 — 8 lines. 



Var. j8. Male. Shanks and feet tawny, with black tips. 



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

 G. Barnston, Esq. 



Xylota communis, Barnstorms MSS., mas. et fem. Nigro-cenea, 

 abdomine nigro, lateribus ceneo maculatis, antennis pedibusque 

 nigris, tibiis basi fulvis, alis cinereis. 



Body brassy black : head as broad as the chest, covered with a 

 slight hoary bloom : mouth and feelers black : eyes dark red : ab- 

 domen black ; sides of the segments adorned with large brassy 

 spots : legs black ; shanks tawny at the base : wings gray, with a 

 slight brown mark on the middle of the fore border. Length of the 

 body 4i— 5i lines ; of the wings 10 — 12 lines. 



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

 G. Barnston, Esq. 



Xylota ^Epalius, n. s., mas. 2Enea,fronte scutelloque fulvis, abdo- 

 mine nigro-ceneo, antenuis ferrugineis, pedibus fulvis, alis subci- 

 nereis ad cos tarn fulvis. 



Body brassy, thickly covered with tawny down ; head a little 

 broader than the chest ; front tawny : eyes dark red ; facets small : 



PART III. 3 D 



