AMERICAN DIPTERA. 



311 



that of the process from which it springs ; below this process is a second, yellow 

 fleshy, upwardly directed process. Wings hyaline. 



Female -Differs from the male in that the proboscis varies from two to tour 

 times the head-height; femora and tibia, of middle and hind legs cil.ate on each 

 side with rather short, black scales and bristles, the scales sparsest on the middle 

 tibise. 5-7 mm. 



North Carolina and Georgia. 



Empis tersa Coquillett. 

 Proc. Nat. Mus., 1895, p. 404. 



Male -Differs from the male of Empis ravida only as follows: abdomen shining 

 reddish yellow; coxa., femora and tibi^ lighter yellowish; first antennal joint 

 twice as long as the second, the third joint twice as long as the farst; proboscis 

 three times as long as the height of the head ; thorax destitute of whitish pile, 

 that on each side of the pleura black, each coxa bearing several black bristles; 

 pile and long bristles of abdomen and venter wholly black. Scutellum bearing 

 four bristles. Abdomen shining, destitute of pollen. Hypopygium ^^^l'. ?«'; 

 rect; the central filament free, filiform, arcuate. Bristles of middle and hind 

 femora rather long. . , 



i^ema/e.-Differs from the male in that the proboscis is six times as long as the 

 height of the head, when bent backward almost reaching the tip of the abdo- 

 men. 6 mm. 



North Carolina. 



Einpis tenebrosa Coquillett. 



Proc. Nat. Mus., 1895, p. 404. 



Male -IDiffers from the female of Empis ravida only as follows: eyes as widely 

 separated as the posterior ocelli. First two antennal joints J-'^f '«!;; ^'je^JJ^ 

 scarcelv longer than the second, the third twice as long as the hrst. Entire pile 

 of the thorax, pleura, coxa., venter and abdomen black. All the femora robust 

 twice as thick as their tibia,, the middle and hind ones bearing numerous, rather 

 long bristles on their under side. 6 mm. 



Texas. 



Empis speotabilis Loew (Fig. 109). 



^'pemalt-Gray, opaque, with short black pile. Head cinereous. Length of the 

 proboscis nearly twice that of the head. Palpi yellow. An enn^ long, tl e fiist 

 two joints dark badious and black-pilose, the third joint black, its apical style 

 stout Thorax quadrivittate with fuscous, the side vitt^ much abbreviated. 

 Cox* reddish, cinerascent towards the base, black-pilose. Legs rufous, the ex-, 

 treme apex of the femora and the apex of each tarsal joint black, the last tarsal 

 ioint wholly black ; the hind femora moderately thickened, the middle and hind 

 femora with small black spines below. Halteres yellowish Wings brownish 

 red the costal cell ochraceous, veins dark brown, stigma lighter fuscous; discal 

 cell short ; anterior branch of the third vein erect. 7 mm. 



Maryland (Osten Sacken). Delaware Co., Pennsylvania. 



TRANS. AM. ENT. SOC, XXVIII. SEPTEMBER, 1902. 



