AMERICAIJ DIPTEEA. ^^ * 



:l ,,: of .he ,..po,.r.iu„ erect, s.™.„ s,.iu,„., -"'"'^f;,;-^; ^ f!; 



as ion. as their tibia, and of slightly greater d.ameter; ^^ -jf^J^jJ;^ ,^^^^ 

 eon.in, fine and long api.ally, especially on the ^^l^^ ZZ^^^^^^^^ 

 the spine-like bristles of the plantar surface of tl^^f/^,^^^*7^'°f/ ' ^^, ,1,^. 

 of the hind knees of the male close to the femero-tibial joint ; hmd femora si en 

 rbumtle thickened at the armament, hind fem.n-a and ^^^^^:;^^ 

 nPMr the tip of the hind femur the underside is produced into a shoi , bipa.t te, 



ending b vend the t P of the wing ; posterior cells long ; hind margin of the dis- 



section. 



Seven males, one female ; Idaho, Oregon. 



Empis niixopolia sp. nov. 

 Male and Female.-R^ther stout small species of gray-brown color Palpi mfus- 

 oatfd morel less at the base, and with one distinct preap.cal ^-tle benea b 

 mst ai^ennal joint once and a half the length of the second joint he third joint 

 ^Ivlatriy small ; occipital bristles moderately long, in two well-defined rows. 

 Thorargraymore r less olivaceous on the dorsum and with the vitta. brown^ 

 scut llum" ay provided with four marginal bristles; the bristles of the pronota 

 colla long TsBiail bunch of hairs present on each side of the pectus; abou 

 en uneven bristles in front of the halteres ; between the four macroch^t* above 

 the ba e ofthe wing and the humeral macroch.ta. at most but three minute 

 ttton the margin of the mesonotum, the humeri with few minute bris- 

 tl^f a dom n wTh ^1^^^ bristles towards the base ; middle lamell. of the hypo- 

 pygium yeTowish at the extreme tip, not entirely concealing the ;;PP-.l--jl - ' 

 the whole of the thickened base of the central filament exposed ; hairs of the 

 hypopygium short. Cox. darkened at the base, their ^--^ -";"^^; '';^;f; ' 

 short reddish the tarsi and the upper side of the femora blackened the biis- 

 t^s of the oter side of the tibi. strong, uniformly widely distant i.e., six on 



^^„^.. SEPTEMBEK, 1902. 



TRANS. AM. ENT. SOC, XXVIII. 



