DIPTERA. 237 
breast adorned on each side with a yellow spot and a short yellow band: ab- 
domen bronze-black, spindle-shaped, much longer but not broader than the 
chest ; an interrupted narrow tawny band on the second segment ; the third 
segment has a broad tawny band which is interrupted by two irregular and 
very slender blach stripes in the ‘middle, and by a very long forked black 
mark on each side; the fourth segment is like the third, but the forked marks 
attain its fore border ; the fifth segment has two pair of tawny marks, the 
side pair very small, the middle pair very large; sixth segment partly 
tawny : legs tawny ; a broad black band near the tip of each hind-thigh ; 
hind-shanks black, tawny at the base ; wings colourless ; wing-ribs tawny ; 
veins black, tawny towards the base; brands pale brown; poisers yellow. 
Length of the body 2} lines; of the wings 4 lines. 
United States. 
Syrpuus coatEscens, Mas et Fem. 
Nigro-eneus, capite pectorisqgue maculis flaris, thoracis lateribus scutel- 
loque fulvis, abdomine nigro fulvo vario, antennis pedibusque fulvis, 
alis limpidis. 
Male. Head black, bright pale yellow above, tinged with hoary and 
clothed with white hairs behind and beneath ; face very prominent between 
the feelers and the epistoma: eyes red; facets on the fore part of the 
crown much larger than those elsewhere : feelers bright pale tawny ; sixth 
joint black, tawny at the base: chest and breast brassy-black ; scutcheon 
and sides of the chest tawny ; a short yellow band and a yellow spot on each 
side of the breast: abdomen black, nearly spindle-shaped, much longer and 
alittle broader than the chest; first segment yellow at the base; a narrow 
tawny interrupted band on the second segment; third and fourth segments 
tawny, with the exception of a black band along the hind border, of a black 
stripe reaching from the hind border nearly to the fore border on each side, 
and of two black triangles in the dish ; a tawny stripe in the middle forms 
the base to each of these triangles which are open to the hind borders; a 
tawny spot on each side of the fifth segment ; tip of the siwth segment ferru- 
ginous : legs tawny ; hind-legs darker: wings colourless ; wing-ribs tawny ; 
veins black, tawny at the base ; poisers tawny. 
Fem. A broad black stripe on the crown, and a broad tawny stripe 
between the feelers and the epistoma: legs yellow; hind-legs pitchy ; 
hind-thighs yellow with a blach band at the tip; hind-shanks tawny at the 
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