AKT. 20 REVISIOJSr OF THE GENUS WINTHEMIA REINHAKD 15 



Male. — Front before ocelli 0.2 of the head width (average of five: 

 0.19; 0.18; 0.2; 0.22; 0.21), rather protuberant below; parafrontals 

 covered with cinereous pollen, becoming thinner and blackish before 

 vertex, thickly black-haired; median stripe wine-red; a little nar- 

 rowed upward and wider than one paraf rontal at triangle ; ocellars 

 of moderate size, directed forward but not much outward; orbitals 

 none; verticals two pairs, outer ones smaller and often hairlike; 

 frontal bristles 10 to 14 in number, extending to level with apex of 

 second antennal joint, directed inward, reduced in size above and 

 stopping before or at ocellar triangle; antennae black, third joint 

 usually reddish near base on inner side, about one and one-half times 

 as long as second; arista blackish, somewhat longer than antennae, 

 thickened almost to middle, penultimate joint as broad as long; face 

 gray pollinose, the sides moderately to thickly haired, at narrowest 

 part about equal to the width of third antennal joint; vibrissae situ- 

 ated above the front border of mouth; cheeks red in ground color 

 gray pollinose, thickly clothed with longish black hairs, in profile 

 about one-sixth the eye height; palpi yellow, frequently infuscated 

 basally, beset with numerous black hairs ; back of head densely pale- 

 haired. 



Thorax black, gray pollinose, marked with five opaque black stripes, 

 often poorly defined, and the thinner median one sometimes obliter- 

 ated in front of suture; scutellum red, covered with uniform thin 

 gray pollen; calypters opaque, white. 



Abdomen black in ground color, the sides more or less tinged with 

 red, this color on intermediate segments somewhat obscured bj'' thick 

 gray pollen, which is interrupted at middle by a large roundish spot 

 on second and a narrow dark stripe on third ; fourth segment reddish- 

 yellowish on apical half or more, the gray pollen on base with a 

 constant opaque black median spot and two longitudinal reflecting 

 stripes on either side, which change from light to dark as the angle 

 changes ; hairs erect or suberect, not very dense ; first segment either 

 with or without one pair of median marginal bristles; second rarely 

 without any, usually with one pair and sometimes with a complete 

 marginal row; third with a marginal row of 10 to 14, large; fourth 

 bearing several irregular rows beyond middle with erect bristly hairs 

 in front ; venter with no defined patches of dense hairs ; genital 

 segments yellowish, small and retracted; inner forceps of moderate 

 length, keeled behind on basal two-thirds, thence flattened and slop- 

 ing to the incised apex; outer forceps yellow, tapering outward to 

 rounded tips, clothed with fine pale hairs on outer side, about three- 

 fourths as long as inner pair; fifth sternite deeply incised, the lobes 

 yellow, bearing a few slender black hairs. 



