AKT 20 REVISION OF THE GENUS WINTHEMIA EEINHAED 45 



Thorax black, covered with dense gray pollen tinged with brown 

 on mesonotum ; the latter marked with five black stripes, the median 

 one narrow and disappearing in front, the outer two pairs not 

 interrupted at suture and separated on entire length by narrower 

 pollen stripes; scutellum reddish at tip, thickly gray pollinose except 

 on basal margin ; calypters opaque, white, the rims faintly yellow. 



Abdomen black in ground color, segments 2 and 3 covered on basal 

 lialf or more with dense pale yellowish-gray pollen obscuring the 

 red color on sides, anal segment red on apical half the remainder 

 densely pollinose; the pollen bands on these segments interrupted 

 by a narrow dark median stripe; no median marginal bristles on 

 basal segment; second usually without but sometimes a pair present; 

 third with a marginal row of about 10, stout ; fourth bearing a mar- 

 ginal and a discal row with only sparse hairs in front and behind 

 the latter; venter of third segment with defined patches of matted 

 long black hairs, none on fourth ; inner genital forceps of moderate 

 length, rather broad at base, narrowed more rapidly beyond middle 

 to the apex; outer forceps about two-thirds as long, with broad 

 evenly rounded tips, yellow. 



Legs black; hind tibiae ciliate with one slightly longer bristle in 

 the row ; mid tibiae with one large median anterior bristle ; claws and 

 pulvilli very short. 



Wings distinctly brown to the third longitudinal vein, the color 

 fading out entirely near the hind border except a tinge along the 

 apical cross vein; first posterior cell open well before wing tip; no 

 costal spine ; third vein bearing one or two setules at base. 



Female. — Front hardly as wide as in male, at the vertex 0.29 of the 

 head width (average of four: 0.29; 0.28; 0.28; 0.31) ; antennae wholly 

 reddish; last joint of front tarsi swollen but not much elongate; 

 second abdominal segment with one pair of median marginals; 

 otherwise very similar to male. 



Length, 7 to 9 mm. 



Type. — In Vienna Natural History Museum. 



Redescribed from 3 male and 12 female specimens from Mexico, 

 Central America, and South America. In the National Museum 

 10 specimens as follows : 1 male and 1 female from British Guinea, 

 the former labeled "sec type Exorista sororcula., J. M. Aldrich," the 

 latter "sec type Tachina xanthocera, J. M. Aldrich "; 2 females, San 

 Rafael, Peru (C. H. T. Townsend) ; 2 females, San Diego, Peru, 

 one labeled "sec type Exorista imbrioo^mis., J. M. Aldrich"; 3 fe- 

 males, Itaquaquecetuba, Sao Paulo, Brazil (C. H. Townsend) ; 1 

 female. La Providencia, Obispo, Guatemala (C. M. Rouillard) ; 1 fe- 

 male, Trinidad Rio, Panama (A. Busck). In the American Museum 

 of Natural History: 1 male and 2 females, Chapada, Brazil (H. H. 



