ART. 20 EEVISION OF THE GENUS WINTHEMIA EEINHAED 17 



thickly black-haired, in profile about one-eighth the eye height, 

 beard white. 



Thorax black, thinly gray poUinose, marked with five opaque black 

 stripes, the median one very thin but continuing before the suture, 

 outer ones broad and not interrupted at suture, and separated by 

 pollen bands of about equal width; scutellum red beyond narrow 

 base, almost destitute of any pollen ; calypters scmitransparent, white 

 with the rims faintly yellow. 



Abdomen black in ground color, the sides more or less reddish; 

 intermediate segments covered with gray pollen interrupted by a 

 large roundish black spot on second and an elongated smaller spot 

 on third; fourth segment largely reddish, with the pollen on basal 

 margin showing a changeable spot on either side of the constant dark 

 median one; hairs on intermediate segments erect or suberect; first 

 segment without median marginals; second with a well-developed 

 pair; third bearing a marginal row of about 10; fourth with several 

 irregular rows near the apex and erect hairs in front; venter with- 

 out any defined patches of dense hairs; genitalia as in duylicata^ 

 but the inner forceps more deeply incised at the apex. 



Legs black; mid tibiae with one large median bristle (two in one 

 specimen) on outer front side near middle; hind tibiae ciliate with 

 or without a longer bristle in the row near middle; claws and 

 pulvilli elongate. 



Wings hyaline, yellowish near base; no costal spine; third vein 

 with one or two hairs at base. 



Length, 8 to 9.5 mm. 



Redescribed from 3 male specimens in the National Museum from 

 South America, as follows: 1, Angol, Chile, December 27, 1926, no 

 collector's label; 1, Perales, Chile, September 23 (A. Faz) ; and 1, 

 Pisecultura, Bariloche, Argentina, October 30, 1926 (Shannon). 



(6) WINTHEMIA DUPLICATA, new species 



Male. — Front at vertex 0.236 of the head width (average of three: 

 0.25; 0.23; 0.23), prominent below, widening rapidly beyond middle 

 to base of antennae; median stripe wine red, not much narrowed 

 upward, at antennae about equal the width of one parafrontal; the 

 latter densely pale grayish-yellow pollinose except at vertex and 

 thickly clothed with black hairs outside of frontal rows; inner ver- 

 ticals moderately developed, outer ones weak or hairlike; orbitals 

 absent; ocellar pair of good size, proclinate but not much divergent; 

 frontal bristles about 12 in number directed inward, extending below 

 middle of second antennal joint, the uppermost reduced to hairs well 

 before the ocellar triangle; face gray pollinose the sides more silvery, 

 rather broad, bearing longish black hairs on the inner margin; 

 66585—31 2 



