118 THE CANADIAN ENTOMOLOGIST 



genus so far as I have discovered, should not possess the organ. 

 Possibly the examination of more material, and living examples, 

 may throw more light upon this matter. 



Chloropisca obtusa, n. sp. 



Female shining yellow. Frontal triangle glossy, brownish 

 black; basal joints of antennae brown, upper margin of third joint 

 blackened, the lower part yellow; face and cheeks yellow; proboscis 

 palpi, and clypeus yellow; arista brown, yellow at base. Meso- 

 notum with the three glossy black stripes very broad, the area 

 between them suffused with black, giving the disk the appearance 

 of being entirely black, the narrow black stripes before wing base 

 separated from the sub-dorsal stripes except anteriorly; mesopleura 

 with a small black spot; the mark on sternopleura reddish yellow, 

 scutellum yellow; postnotum glossy black. Abdomen with a 

 broad, black, foremarginal band on each segment. Legs yellow: 

 apical three joints of fore tarsi and apical joint of other tarsi 

 blackened; sensory organ not differing from colour of hind tibia. 

 Wings clear, veins brown, last section of fourth vein less distinct 

 than the other veins. Halteres whitish yellow. 



Frontal triangle occupying about three-fourths the width of 

 frons at vertex, carried forward of almost equal width for almost 

 two-thirds the length of frons, then gradually tapering to just 

 above antenna?, the apical third leaf like, the sides slightly convex, 

 surface unpunctured, smooth; third joint of antennae about 134 

 times as long as broad; arista about as long as width of frons at 

 anterior margin; face slightly receding; cheek about one-fifth as 

 high as eye; eye distinctly, but not greatly, higher than long. 

 Scutellum distinctly broader than long, not so noticeably sub- 

 triangular as in glabra Meigen, the apical bristles present. Legs 

 slender, the fore tarsi not thickened ; sensory organ occupying about 

 three-fifths the length of the hind tibia. Wing with discal cell 

 narrow, inner cross-vein well before end of first vein; penultimate 

 section of fourth vein distinctly longer than basal section of third, 

 longer than last section of fifth and about half as long as last section 

 of fourth. 



Length: 3.5 mm. 



