THE CANADIAN ENTOMOLOGIST. 267 



two, separated by a wide space, on the other ; antennre reaching at least 

 three-quarters of the distance to the oral margin, black, including the 

 arista, and thinly dusted with whitish pollen ; second segment slightly 

 shorter than the third ; arista thickened on the basal three-fourths, its 

 second segment a little over twice as long as wide ; parafacials and cheeks 

 thickly, the facial plate and occiput rather thinly silvery-gray pollinose^ 

 cheeks below the end of the eyes and the extreme edge of the oral margin 

 tinged with reddish ; vibiissse situated well above the oral margin, which 

 projects beyond the vibrissal angles for a distance greater than half the 

 length of the second antennal segment ; oral margin caudad of the 

 vibrissfB, with a row of strong macrochaetae, facial ridges bristly on the 

 lower fifth ; width of cheeks equal to about one-half of the height of the 

 eye, cheeks with black bristles and bristly hairs at middle ; palpi small, in 

 female type not much longer than, in male co-type about twice as long as, 

 the greatest diameter of the mediproboscis, their surface black, thinly 

 whitish-dusted. 



Mesonotum black, appearing when viewed from above polished, 

 appearing thinly dusted with grayish pollen when viewed from behind ; 

 pollen becoming more dense anteriorly and upon the humeri ; anterior 

 part of the mesonotum indistinctly vittate ; pleura very thinly whitish- 

 dusted ; four sternopleural bristles, formula i: 2: i, three pairs of 

 postsutural and but one pair of postacrostichal bristles; scutellum polished, 

 with rather more than the apical half red, the remainder blackish, three 

 strong marginal, a pair of weak discal, and a pair of cruciate apical 

 macrochsetae, the latter backvvardly directed ; legs black, polished, thinly 

 dusted with grayish pollen, coxae faintly tinged with reddish, claws and 

 pulvilli in male elongate, in female short, anterior tarsi of the female 

 broadened and flattened, middle tibiae with several strong macrochset?e on 

 the front side near the middle ; calypteres orange; wing venation as in Z. 

 hcemorrhoidalis F., the wings grayish tinged, the veins dark brown, 

 bordered with dilute brownish, four or five bristles at base of R^^.,, and the 

 median cross-vein almost straight. 



Abdomen black, polished, very thinly grayish dusted ; the pollen 

 only apparent when the specimen is viewed from behind ; in the male a 

 small spot on each side of the abdominal segment red ; second 

 segment with strong median discal and marginal macrochastae, and third 

 segment with median discal discals and a marginal row of macrochsetae ; 

 fourth segment rather thickly covered with macroch^tse ; sides of 

 abdomen with both discal and marginal macrochsetse, more prominent in 



