ABT. 20 REVISION OF THE GENUS WINTHEMIA KEINHAED 27 



Decker). The last has been reported as W. quadrlpustulata, accord- 

 ing to my determination, by Mr. Decker in Iowa Experiment Station 

 Hesearch Bulletin No. 125. 



(13) WINTHEMIA BOREALIS, new species 



Male. — Front at vertex 0.25 of the head width in the one specimen, 

 rather prominent below; parafrontals golden poUinose to vertex, 

 sparsely clothed with rather short black hairs below, which become 

 longer and denser before vertex ; median stripe brownish black, much 

 narrower than one parafrontal on its entire length; verticals two 

 pairs, the outer ones about the size of postocellars ; no orbitals ; ocel- 

 lars broken off but the scars indicating bristles of the usual size; 

 frontals about 14 in number, directed inward and extending to level 

 with apex of second antennal joint, uppermost bristles small, situated 

 about opposite the apex of triangle; face strongly receding, gray 

 pollinose, the sides golden on upper three-fourths, rather thickly 

 beset with longish black hairs ; vibrissae on level with front edge of 

 mouth; cheeks gray pollinose, black-haired, in profile about one- 

 seventh the eye height ; i^alpi yellow ; antennae blackish, three-fourths 

 the length of face, third joint less than twice as long as second; arista 

 slightly thickened on proximal third, reddish, penultimate joint 

 hardly longer than wide ; beard grayish white, rather bushy. 



Thorax black, thickly gray pollinose including the mesonotum, 

 which is marked with five widely separated black stripes ; scutellum 

 reddish on apical half or more, gray pollinose, disk covered with 

 Tather long fine erect hairs ; calypters opaque, white. 



Abdomen with anal segment wholly bright orange-yellow, this 

 color extending forward on the venter to middle of third segment, the 

 remainder and the basal segments almost entirely black but faintly 

 tinged with red on the sides; segments 2 and 3 largely covered with 

 <;hangeable bluish-gray pollen, which is rather dense on the narr-ow 

 basal margin, becoming thinner behind but extending almost to the 

 hind border of each; fourth segment shining, with gray pollen on 

 basal fourth interrupted by reflecting spots, which change from light 

 to dark as the angle varies; first segment with one pair of smallish 

 median marginal bristles; second with two pairs and the third witli 

 a marginal row of about 14, all moderately stout ; fourth with several 

 irregular rows on apical half; hairs on intermediate segments rather 

 coarse, long, and deiDressed; venter thickly long-haired but without 

 any sharply defined patches; genital segments yellow, retracted; 

 inner forceps tapering gradually from base to apex united and 

 keeled behind as usual the tip moderately incised ; outer forceps yel- 

 low, about three- fourths the length of inner ones, narrowed out- 

 wardly, the tips blunt or broadly rounded. 



