2 THE CANADIAN ENTOMOLOGIST. 



2. Wiih 3 postsutural bristles, 3rd joint of antenna neaily ^ times as long 



as 2nd ; arista thickened almost to middle obscura Coq. 



With 4 postsutural bristles, 3rd joint of antenna ij^ times as long as 

 2nd ; arista thickened on basal yi fumiferanœ^ n. sp. 



3. Palpi, scutellum and apex of abdomen black antennalls Coq. 



Palpi, scutellum and apex of abdomen y^Wowxsh.quaJripustulafa Fab. 



Wintheviia fumiferance^ n. sp. 



Black species with palpi, scutellum and usually antennae and sides 

 of 2nd and 3rd segments of the abdomen yellowish ; thorax, abdomen and 

 legs lightly dusted with whitish pollen ; 4 postsutural ai^ 3 sternopleural 

 bristles ; hind legs ciliate. Length, 7-9 mm. 



Head %\ times as broad as long; front in male Yz width of eye, in 

 female equal to width of eye; frontal vitta in female 1^2 times width of 

 parafrontal plate (measurements taken immediately anterior to ocellar 

 j-riangle) ; parafacials at narrowest point }^ as wide as facial plate at 

 widest point j gense 1/6 eye height; antenrce reaching to lowest y^ of 

 face, 3rd joint in both sexes \'%_ times length of 2nd ; arista thickened on 

 basal ^3, 2nd joint i^ times as long as broad. Colour of head except 

 eyes whitish pollinose on black ground ; frontal vitta black ; frontalia, 

 parafacialia, facial plate, occiput and genae whitish pollinose on black 

 ground ; antennae varying from black to yellowish in all its segments, palpi 

 yellow. A strong pair of proclinate ocellar bristles in both sexes ; females 

 with two pair of, males without orbital bristles ; frontal bristles to, or 

 slightly beyond base of second antennal joint; parafacials with numerous 

 fine black hairs on upper ^3 ; bristles of facialia on lower }{ only. 



Thorax including the pleurae light grey pollinose on a black ground, 

 the pollen being somewhat irregularly distributed ; scutellum blackish at 

 base and yellowish at apex, the extent of yellowish area varying in 

 different specimens. Four pairs of postsutural dorsocentral bristles (in 

 one specimen only 3 pairs), 3 pairs of postacrostichals and three sterno- 

 pleurals, the latter usually strong but the lower one absent on one side in 

 one specimen ; scutellum with three strong pairs of marginal, and a pair 

 of cruciate apical and several weak discal bristles. 



Legs black ; coxae and femora strongly, tibiae and tarsi faintly, whitish 

 pollinose ; middle tibiae with 2 or 3 bristles on front side near the middle ; 



