14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. G.".. 



Type locality. — Saaaiich, British Columbia, May 17, 1919, W. 

 Downes. 



DistHhution. — Whitehall, Montana, July 11, 1917, H. G. Dyur, 

 collector. Forest Grove, Oreg., September 30, 1918, F. R. Cole, 

 collector. Gold Creek, Mont., July 29, 1918. Moscow Mountain. 

 Idaho, July 5, 1919, June 26, 1920, A. L. Melander, collector. 



7. SCELLUS FILIFERUS Loew. 



Plate 1, fig. 5 ; plate 2, figs. 14 and 17 ; plate 3, fig. 29. 



Scellus fiUfei-us Loew, Mouographs of North American Diptera, 1864, pt. 2, 

 p. 209. 



Male. — " Thoracis dorso cinereo, opaco, abdomine cupreo, cinereo- 

 pollinose, subopaco, halteribus albidis, alis hyalinis in basi subalbidis, 

 apicem versus cinereo-striatis punctisque duobus majusculis nigri- 

 cantibus, altero didymo in vena transversa posteriore, altero siniplici 

 in ultimo venae longitudinalis quartae segmento; lamellis analibus 

 maris angustissimis albis, in basi nigris, in summo apice flavicantibus. 



" Upper side of the thorax gray, opaque ; abdomen copper-colored 

 with grayish dust, rather opaque; halteres whitish; wings hyaline, 

 whitish near the root^ with gray stripes toward the tip; upon the 

 posterior transverse vein with a double blackish spot of considerable 

 size, and with a similar, but single spot upon the last segment of the 

 fourth longitudinal vein; the anal appendages of the male are very 

 narrow, white, black at the basis and yellowish at the extreme tip. 

 Long. Corp. 0.15, Long. al. 0.20, 



" The narrow face is ocher-yellow. Antennae black. Front with 

 white dust. Thorax blackish -bronze colored with copper-colored 

 reflections; on the upper side with thick whitish dust, which almost 

 conceals the ground color, opaque ; upon the pleurae with a somewhat 

 thinner dust of the same color. Upon the middle of the upper side 

 there are two narrow parallel lines of a darker color, which do not 

 reach as far as the posterior margin of the thorax. The scutellum, 

 which has two bristles, is of the same color as the pleurae. The 

 ground color of the abdomen is like that of the thorax, is, however, 

 more distinct, not being so thickly covered with dust; toward the 

 lateral margin of the abdomen, where the dust almost entirely dis- 

 appears, there is a bright copper-colored luster. The anal appendages 

 of the male, which are turned upward at the tip, are not ribbonlike, 

 as in the previously described three species, but filiform, white, black 

 at the root, at the tip pale yellowish to a small extent ; on the middle 

 of their exterior margin there is a dense beard of delicate little white 

 hairs; there is no tuft of hairs at their tip. Between them, in the 

 anal region, only a moderate number of short delicate little hairs, 

 which may be easily overlooked, are inserted. Coxae of a blackish- 



