LIST OF DIPTERA. 603 



Helophilus Anausis, n. s., fem. Niger, fronte flam, thoracis vittis 

 duabus cinereis, lateribus scutelloque ferrugineis, abdominis fas- 

 ciis cinereis vittisque duabus flavis, antennis fulvis, pedibus fer- 

 rugineis, tibiis piceo vittatis, alis subcinereis. 

 Body black: head a little broader than the chest, thickly 

 clothed with dark tawny hairs, yellow in front : eyes dark red : 

 mouth piceous : feelers tawny ; bristle piceous : chest clothed with 

 short tawny hairs, adorned with two gray stripes ; sides dark ferru- 

 ginous; scutcheon ferruginous: abdomen linear, as broad as, and 

 much longer than the chest, adorned with alternate broken and en- 

 tire gray bands, and with a short yellow stripe on each side 

 of the base: legs ferruginous; hips black; thighs with pitchy 

 streaks ; feet pitchy towards the tips ; foot-cushions tawny : wings 

 slightly gray ; wing-ribs and veins piceous, the latter ferruginous 

 towards the base ; poisers pale tawny. Length of the body 3J lines ; 

 of the wings 7 lines. 



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

 G. Barnston, Esq. 



Helophilus formalis, n. s., fem. Niger, scutello fulvo, abdominis 

 macula utrinque yentreque fulvis, fasciis tribus flavis, apice fer- 

 rugineo, antennis piceis basi ferrugineis, pedibus nigris, tibiis 

 fulvis, femoribus posticis nigro-ceneis, tibiis posticis ferrugineis, 

 alis cinereis. 



Body black : head covered with tawny down, clothed with taw- 

 ny hairs: mouth ferruginous: feelers pitchy, ferruginous at the 

 base; bristle ferruginous: chest and breast thickly clothed with 

 short tawny hairs ; scutcheon tawny: abdomen nearly linear, a little 

 shorter and narrower than the chest, thinly clothed with short tawny 

 hairs, adorned on each side with a large tawny spot and with three 

 curved pale yellow bands, dark ferruginous towards the tip ; under- 

 side tawny : legs black, clothed with short tawny hairs ; shanks and 

 feet covered beneath with tawny down ; shanks tawny, black towards 

 the tips ; underside tawny : legs black, clothed with short tawny 

 hairs ; shanks and feet covered beneath with tawny down ; shanks 

 tawny, black towards the tips ; claws and foot-cushions tawny ; 

 claws black towards the tips ; hind thighs brassy black, rather thick ; 

 hind shanks ferruginous, curved: wings gray; wing-ribs pitchy; 

 veins black, tawny towards the base ; poisers pale tawny. Length 

 of the body 4 lines ; of the wings 7 lines. 



a. Mexico. Presented by E. R. Coffin, Esq. 



