SYNOPSIS OF NORTH AMERICAN SYRPHID^. 16^ 



ly plumose on the basal portion. Dorsum of thorax, pleurae, and scutel- 

 lum, with very abundant and long bright yellow pile, less abundant on 

 the disk of the dorsum, where the deep black ground color is apparent, 

 and the pile also frequently more or less intermixed with black, some- 

 times broadlj' and conspicuously black (var. melanostomus Lw.). Scutel- 

 lura wholly light yellow. Abdomen deep black, everywhere shining^ 

 on each side of the middle of the second segment frequently the ground 

 color is deep reddish ; pile dense, in color black and yellow variable, 

 usually on the first segment, and more or less on the second, longer 

 yellow ; sometimes the yellow, with a reddish cast, covers the entire 

 abdomen except the tip, the fifth segment usually yellow pilose. Legs 

 deep black, with black pile ; knees reddish, anterior tarsi brown, middle 

 and posterior pairs conspicuously light reddish-yellow, except their tip, 

 hind femora somewhat elongate, hind tibiiB bent. Wings hyaline, veins 

 luteous, in the female with a large brown spot. 



A very common and fine species, in appearance strikingly resembling 

 Mallota posticata. Thirty specimens. 



Eristalis compactus. (Plate VII, fig. 9.) 



EristaUs compactus Walker, List, etc., iii, 619. 

 Eristalis atriceps Loew, Centur., vi, (34. 



Eahita.t.—^m\^o\\ Bay Terr;tory (Walk.), White Mountains, Canada 

 (Lw.), Connecticut! 



5,9. Length, 9 to 10™". Black, shining. Face on the sides lightly 

 covered with whitish pollen and thin whitish pile. Front in female 

 yellow pilose below ; on the sides lightly pollinose above, clothed with 

 black pile. Antennne red, third joint unusually large; arista bare. 

 Eyes wholly lightly pilose. Dorsum of thorax shining, with reddish 

 pile on the sides, more obscure in the middle. Pleurae mostly black 

 pilose ; scutellura brownish red with black pile, along the border the 

 pile is reddish. Second segment of the abdomen on the sides with the 

 usual triangle red, or brownish red, and, extending across between, a 

 shining fascia, not interrupted in the middle, the black elsewhere deep- 

 opaque, hind border yellow; third segment and also the fourth, except 

 their yellow hind border, wholly shining, the posterior part of the third 

 segment, however, less distinctly so, subopaque ; hypopygium, or fifth 

 segment, wholly shining. Pile on the sides of the segments reddish, 

 along the lateral margins on the front part of the segments whitish, and 

 at the tip of the abdomen intermixed with light-colored pile, on the 

 black portions short, thick, black. Venter black, shining, with long, 

 whitish pile, the posterior margins of the segments whitish. Legs red- 

 dish, black pilose, hind femora not thickened, basal part of femora and 

 last three joints of tarsi black, the distal end of anterior and posterior 

 tibiae more or less brownish, the tibiae at the base yellow. Wings hyaline, 

 veins black; the anterior i)art as far as the cross-vein, and reaching a 

 little into the base of the second basal cell, brown. 



