AMERICAN DIPTERA. 297 



British America. 



The synonymy is Mr. Coquillett's, and likewise the introduction 

 of the species into the analytical table is done on Mr. Coquillett's 

 authority for the number of scutellar bristles. 



Empis gnlosa Coquillett. 

 Proc. Nat. Mus., 1895, p. 408. 



Female. — Head black, bluish gray pollinose ; antennae black, third joint broad 

 at the base, rapidly tapering toward the apex, style slender, more than one-half 

 as long as the third joint; proboscis one-half longer than the height of the head, 

 palpi brown. Thorax black, opaque gray pollinose, marked with four dark 

 bi-ownish vittfe; its very sparse pile black; pleura black, bluish gray pollinose, 

 pile in front of the halteres black; scutellum black, grayish pollinose, bearing 

 four bristles. Abdomen black, opaque brownish pollinose, that on the hind and 

 lateral margins of the segments light gray ; on the hind margin of the first three 

 segments toward the sides is a fringe of rather long black bristles, most devel- 

 oped on the second segment. Legs slender, simple, yellow, including the coxfe ; 

 tarsi towards the apex brown; femora destitute of long bristles; middle meta- 

 tarsi slightly thicker, but shorter than the front ones; hind metatarsi much 

 thicker than the middle ones, snhequal in length to the front ones. Knob of the 

 halteres yellowish white. Wings grayish, stigma nearly obsolete, veins dark 

 brown, no long bristles on the costa near its Vjase. 7 mm. 



Illinois (Robeftson). 



Einpis liiiinile Coquillett. 

 Proc. Nat. Mus.. 1895, p. 403. 



Male. — Head black, gray pollinose, except on oral margin ; eyes separated a 

 shorter distance than the width of the lower ocellus, facets of a uniform size; 

 antennae having the two basal joints brownish yellow, the third black, rather 

 narrow, gradually tapering to the tip, style over one-half as long as the thiid 

 joint; proboscis from two to three times as long as the height of the head, palpi 

 light yellow. Thorax, pleura and scutellum black, opaque grayish pollinose, the 

 rather long pile of thorax and scutellum black; thorax with two blackish vitta?, 

 scutellum bearing four bristles. Abdomen black, shining, the pile rather long 

 and abundant, black ; hypopygium large, lamellae largely yellow, middle ones 

 oblong, slightly tapering to tip, not longer than the broad upper ones; filament 

 slender, almost bristle-like, arcuate. Legs simple, rather robust; coxae black, 

 femora brownish yellow, lighter yellow at the base, tibiae and tarsi light yellow, 

 tarsi brownish towards apex ; middle and hind legs provided with rather long, 

 stout, black bristles; front and hind metatarsi subequal in size, the middle meta- 

 tarsi considerably more slender and only two-thirds as long as either of these. 

 Knob of halteres yellow. Wings brownish gray, costal cell and border to some 

 of the veins yellowish ; stigma and veins brown. 



Female. — Same as the male, with these exceptions: prothorax, the lateral mar- 

 gins of the thorax, the scutellum, metanotum, pleura and abdomen yellowish, a 

 black spot above the middle and hind coxae, a transverse one on the lower part 

 of the metanotum and sometimes a brownish fascia near or on the hind margin 



TKANS. AM. ENT. SOC, XXVIII. (38) AUGUST, 1902. 



