234 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



ish scales (somewhat rubbed off in my specimens); some black pile in 

 the posterior corners of the segments, beginning with the second. 

 Yenter reddish, sparsely beset with yellowish scales. Legs black ; fe- 

 mora beset with fulvous scales. Wings hyaline, brown anteriorly, 

 which color is bounded by the fourth vein before the small cross-vein 

 and by an oblique line running to the end of the first vein after it ; 

 cross veins at the base of the third and fourth posterior cells with broad 

 brown clouds. Length 12-13 mm . 



Hab.— Denver, Colo. (P. B.Uhler); onefemale. Asecond specimen, also 

 from Denver (by the same), is a little larger; the proboscis is protruding a 

 little beyond the oral margin ; the brown of the wings is darker and en- 

 croaches considerably on the second basal, and also a little on the anal 

 cells ; the posterior femora are more densely clothed with fulvous scales ; 

 the two last posterior cells are longer. I, am in doubt whether to con- 

 sider this a distinct species or not. The wings of this species must 

 be very like those of E. sordida Loew ; but the latter must have a 

 longer proboscis, and the antennas, I suppose, must be like those of E. 

 fasciata, to whom Dr. Loew compares it,— that is, the third joint must 

 be three or four times longer than its style, and not nearly equal to it in 

 length. 



10. Exoprosopa dodeans n. sp.— The brown of the anterior part of 

 the wing is bounded by the basal cross-veins, by the fourth vein as far 

 as the small cross- vein, beyond which the boundary-line runs obliquely 

 toward the end of the first vein ; the second basal cell at its proximal 

 end is considerably encroached upon by the brown ; the first posterior 

 and first submarginal cells likewise ; the remainder of the wing is hya- 

 line, without any spots or clouds, except an indistinct one on the cross- 

 vein at the base of the fourth posterior cell. Head black, clothed with 

 golden-yellow short pile ; oral margin reddish ; antennse black; first joint 

 red; third joint conical, with a style half as long as the joint; probos- 

 cis projecting about half the length of the head beyond the oral mar- 

 gin. Thorax grayish-black, with yellowish pile, more whitish above 

 the root of the wings ; scutellum reddish, black at base ; abdomen black, 

 with very little red on the sides ; second segment with the usual white 

 cross-band on its anterior half; the other segments beset with yellow 

 and white scales; sides with yellowish hair at the base and black 

 hair on the segments beyond the second ; venter reddish, with white 

 scales on the first four, and with yellow ones on the following segments. 

 Halteres brownish at the base of the knob ; its tip yellowish. Legs 

 densely beset with fulvous scales, which cover the ground-color ; tarsi 

 black. Length 12 mm . 



E. dodrans is, in many respects, very like E. tihtbans; it is, however, 

 a little smaller ; the brown on the wings is of a very uniform tinge, with 

 no reddish nor subhyaline spots in it. In E. titubans, the brown is more 

 reddish, the costal cell more yellowish, and the proximal end of the sub- 

 marginal cell has a paler, almost subhyaline, spot in it; the clouds on 





