ART. 20 EEVISIOF OF THE GENUS WINTHEMIA — REINHAKD 13 



third, slender and darker in color beyond, basal joints short; palpi 

 j^ellow, bearing a few long hairs on lower edge ; cheek in profile about 

 one-sixth the eye height, thinly gray pollinose on red ground color 

 and thickly covered with black hairs; beard white, rather bushy. 



Thorax black, thinly gray pollinose; dorsum marked with five 

 narrow black stripes, which are sometimes very indistinct behind the 

 suture; scutellum red, lightly dusted with white pollen. Chaeto- 

 taxy: Acrostichal, 3, 3; dorsocentral, 3, 4; humeral, 5; posthumeral, 

 2; presutural, 2; intraalar, 3 (none near suture) ; supraalar, 3; post- 

 alar, 2 or 3; pteropleural, 1 (small) ; sternopleural, 2, 1; scutellum 

 with 3 lateral, 1 discal, and 1 decussate apical pair, the latter about 

 as large as the median lateral; calypters semitransparent, white. 



Abdomen rather pointed at apex, black with the sides tinged with 

 red, subshining; the gray pollen on last three segments interrupted 

 by a narrow dark stripe expanding to a roundish spot on the second 

 segment; hairs rather fine, long, and erect; first two segments each, 

 with a pair of long median marginals; third with a marginal row 

 of 12 to 14, large; fourth entirely covered above with erect bristles 

 becoming weaker toward the apex; venter without defined patches 

 of hairs ; inner genital forceps feebly keeled near base behind, hardly 

 at all tapering outward, the apex suddenly narrowed to an acute 

 curved beak; outer forceps yellow, slightly longer than the inner, 

 tapering to apical fourth thence expanded with the tips broadly 

 rounded, the outer sides thickly pilose; fifth sternite blackish, with 

 a broad deep V-shaped incision, the lobes bearing a few long fine 

 black hairs. 



Legs black; mid tibiae with two or three stout bristles on outer 

 front side; hind tibiae ciliate, usually with one, sometimes two, longer 

 bristles in the row ; claws and pulvilli elongate. 



Wings grayish hyaline tinged with brown at base; fourth vein 

 with a sudden oblique bend curving inward shortly beyond, thence 

 straight, reaching costa well before wing tip ; third vein with two to 

 four hairs at base ; costal spine minute. 



Female. — Front at vertex 0.335 of the head width (average of 

 four: 0.36; 0.34; 0.32; 0.32), widening gradually to base of antennae; 

 median stripe broad to triangle; inner and outer verticals strong; 

 orbitals two pairs; sides of face distinctly narrowed downward; 

 antennae red, third joint more than twice the width of parafacial 

 at narrowest part; abdomen broader than in male and usually with 

 less red color on sides, the hairs are coarse, often bristlelike along 

 the median line; hind tibiae with a row of uneven bristles on outer 

 edge; claws and pulvilli minute. 



Length, 6.5 to 12 mm. 



Type. — In the Canadian National Collection, from Duncan, Brit- 

 ish Columbia. 



