70 entomological news. [March, 



ately deep furrows for the reception of antennae; proboscis and palpi 

 short; bristles black, three facial pairs convergent, the ocellar pair strongly 

 proclinate, the two fronto-orbital and the vertical pairs strictly reclinate. 



Thorax shining black with four rather broad, longitudinal, whitish lines 

 on dorsum, the outer pair longer and narrower than the inner pa'ir; scu- 

 tellum except the base and sides, halteres, and a line running from the 

 humeri to the base of each wing, light yellow; the thoracic and four 

 scutellar bristles black. 



Abdomen shining black, posterior border of segments two, three and 

 four with a rather broad band of white; sixth segment of male small, 

 partially or wholly concealed beneath the fifth; seventh segment of female 

 a little longer than sixth, flattened or slightly concave, ventrally; sheath 

 of ovipositor and ovipositor reddish brown; the sheath cylindrical and 

 covered with fine triangular scales; ovipositor dagger shaped; a few short 

 black marginal bristles on last three segments. 



Legs clay-yellow; posterior and middle coxae and femora except tips, 

 black; anterior femora with only a little black. Wings hyaline, marked 

 with four brown cross-bands, the first is somewhat oblique and runs from 

 the humeral vein to the sixth longitudinal vein, along which it gradually 

 fades out beyond the posterior basal transverse vein; the second is much 

 broader, nearly perpendicular, begins on the costa between the tips of the 

 auxiliary and the first longitudinal vein and extends across the middle of 

 the fifth longitudinal vein, fading out before reaching the posterior mar- 

 gin of the wing; the third is nearly parallel with the second, not quite as 

 broad, runs over the posterior cross-vein, and reaches the posterior mar- 

 gin just behind the tip of the fifth longitudinal vein; the fourth band is 

 oblique, completely united with the third on the costal border and reaches 

 the posterior border at the tip of the fourth longitudinal vein; first longi- 

 tudinal vein with very short black bristles ; the anterior cross-vein is 

 a little more oblique and very slightly curved; anal cell not drawn out to 

 a point. Length $ 3.5-4. mm.; $ 4-4.5 mm. 



Many males and females from eastern and western Washington 

 and western Idaho. The marking on the wing closely resemble 

 Figure 11, Plate X, Loew's Monographs, Part III, but the spot 

 at the tip of vein three is wanting, the first cross-band reaches 

 farther down on vein six, the second fades out gradually a little 

 nearer the margin than is indicated in Loew's figures. The 

 posterior basal transverse vein forms almost a right angle at its 

 union with the fifth longitudinal vein, thus cutting the anal cell 

 of! squarely. In Loew's figure these veins form an obtuse angle 

 at their junction and the anal cell is drawn out to a point. This 

 species also differs from the description of R. cingulata in having 

 the four light stripes on the thorax and in having more black on 

 the femora. 



