LIST OF DIPTERA. 531 



those of a little part on each side very small : mouth and feelers 

 black, the latter a little longer than the head ; tip of the second 

 joint piceous : chest and breast clothed with pale yellow hairs ; 

 scutcheon yellow, armed with two yellow teeth, whose tips are fer- 

 ruginous : abdomen a little broader, but hardly longer than the 

 chest, thinly clothed with short pale yellow hairs ; hind border of 

 each segment adorned above with a broad short tawny band on each 

 side, and beneath with an entire band ; tip tawny : legs tawny, 

 clothed with short yellow hairs ; hips and thighs black ; tips of the 

 latter tawny : wings colourless, slightly tawny along the fore bor- 

 ders; wing-ribs, fore border-veins, and cross-veins tawny; the other 

 veins yellow; poisers tawny. Fern. — Head tawny; crown black. 

 Length of the body 5 — 6 lines ; of the wings 9 — 11 lines. 



Var. /3. Fern. — Thighs tawny, each adorned with two black 

 bands. 



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

 G. Baruston, Esq. 



Stratiomys nigrifrons, n. s., mas. Nigra, scutelli margine postico 

 flavo, abdominis lateribus maculisque ad apicem duabus flavis, 

 ventris fasciis Jlavis, antennis pedibusque nigris, tibiis apice tar- 

 sisque fulvis, alis fuscis. 



Body black : head as broad as the chest, clothed with tawny 

 hairs : eyes black ; a small part on each side composed of very small 

 facets : mouth and feelers black : chest and breast clothed with dark 

 tawny hairs ; hind border of the scutcheon yellow, armed with two 

 tawny spines : abdomen nearly oval, a little broader and longer 

 than the chest, thinly clothed with short tawny hairs, yellow on each 

 side, and adorned with a yellow spot on each of the two last 

 segments ; hind border of each segment on the underside adorned 

 with a yellow stripe, which is widened in the middle : legs black, 

 clothed with short tawny hairs ; shanks tawny towards the base ; 

 feet tawny ; hind shanks tawny, with two black bands : wings 

 brown ; wing-ribs piceous ; veins ferruginous ; poisers tawny, with 

 apple-green knobs. Fern. — All the facets of she eyes very small : 

 hind border of the scutcheon tawny : sides and hind borders of the 

 segments of the abdomen tawny, its upper side also adorned with a 

 short tawny stripe at the tip, and with a large tawny spot on each 

 side of the base : feet piceous above ; claws black, tawny at the 

 base ; knobs of poisers tawny. Length of the body 6 — 6^ lines; of 

 the wings 10 — 11 lines. 



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

 G. Barnston, Esq. 



