ART. 20 EEVISION" OF THE GENUS WINTHEMIA REINHAED 43 



Male. — Front (vertex) 0.24 of the head width (average of four: 

 0.24; 0.24; 0.23; 0.25), not much wider at base of antennae; para- 

 frontals rather densely short-haired, covered with gray pollen, which 

 becomes thinner above showing a black color near the vertex ; median 

 stripe reddish brown, hardly at all narrowed behind, where it is 

 deeply cleft by the triangle, which is thinly poUinose; verticals two 

 pairs, rather short ; no orbitals ; ocellars distinct but not very large ; 

 frontal bristles directed inward stopping before triangle, the lower- 

 most ones at or a little below base of second antennal joint; face 

 gray pollinose, the sides bearing about a dozen slender hairs along 

 the inner margins ; vibrissae on oral margin with three or four coarse 

 bristles on the ridges above; palpi yellow; antennae reddish, third 

 joint darker, broad to tip and from three to four times the length of 

 second; arista longer than antennae, thickened on proximal third, 

 penultimate joint slightly longer than broad; cheeks red in ground 

 color, gray pollinose, thickly clothed with short black hairs, about 

 one-eighth the eye height; eye long and narrower than usual in lat- 

 eral aspect, by micrometer the profile width 12 and the length 31 

 units ; beard bushy, white. 



Thorax cinereous pollinose, marked with four widely separated 

 black stripes in front of suture and five behind ; scutellum red, uni- 

 formly gray pollinose except at base, the decussate apical bristles 

 larger than usual, hairs on disk short; calypters white tinged with 

 yellow. 



Abdomen without median marginals on segments 1 and 2; third 

 with a marginal row of 10 to 12, large; fourth covered with erect 

 bristly hairs at base becoming longer and stronger toward apex; in 

 some lights the dark color of the intermediate segments extends for- 

 ward on either side of the median line so that the pollen bands appear 

 narrower above; pollinose band on base of fourth segment showing 

 reflecting spots which change from light to dark as the angle 

 changes, the apex red; genitalia larger than usual; outer forceps 

 yellow, broad with blunt tips and bearing a few pale hairs on outer 

 side; inner forceps blackish, a little longer than outer ones, in profile 

 strongly bowed and rather thick to middle, feebly keeled on narrow 

 base behind and hardly at all tapering to the divided apex. 



Legs black; mid tibiae with one large bristle on the outer front 

 side near middle. 



Wings grayish hyaline; fourth vein with a sudden oblique bend, 

 concave shortly beyond thence straight to costa ending well before 

 wing tip; third vein with one or two hairs at base; costal spine 

 minute. 



Female.— Front at vertex 0.275 of the head width (average of 

 four: 0.28; 0.27; 0.29; 0.26) ; thorax densely cinereous pollinose; up- 

 permost two or three frontals reclinate, and the usual two pairs of 



