THE CANADIAN ENTOMOLOGIST. 121} 



that the thorax above shows a long shining black median stripe and two- 

 shining black spots on each side ; scutellum gray-wliite ; pleura black, 

 gray pollinose ; cox;« black, t'ront ones white pollinose, and front and 

 middle coxas with white hair at tips ; legs reddish-yellow, front and middle 

 femora mostly black, but pale at base, hind femora black on apical half, 

 tibia? black at tips, and the tarsi mostly black above, femora shining, all 

 with white hairs and bristles, but black bristles on tarsi and tips of tibiae, 

 hind femora with short, white, spine-like bristles beneath, all bristles on 

 hind tibia? very short, but little longer than the width of the joint. 

 Abdomen dull blackish, with short, sparse white hair, tips of segment gray ; 

 hypopygium reddish. The large bristles on sides of thorax are yellowish ; 

 the wings hyaline ; venation black, the costa and radius near the middle 

 a trifle heavier and deep black, but not swollen. 



Length, lo mm. 



From Bill Williams' Fork, Arizona, August (Snow). 



Oi/unatius preiiosiis, n. sp. 



Face white pollinose, wnth long white hair below and a ^t\w longer 

 black ones, white hair behind mouth-parts ; second joint of antennae 

 reddish, rest blackish ; thorax dull blackish, a large whitish pollinose spot 

 each side in front, and one behind over the base of wang, and narrowly 

 connected to the anterior spot ; behind w^hitish pollinose, also over the 

 scutellum and on each side metathorax ; pleura grayish pollinose ; legs 

 yellowish, with long white hair and some black bristles, a black spot each 

 side at tips of femora, and the tips of tibiae (especially the hind pair) 

 darker, hind trochanters black, and in male the hind femora have a broad 

 black band nearly covering the entire joint, in female only a long black 

 streak above. Abdomen reddish-yellow, base black, and the apical seg- 

 ments infuscated, in female the base is only black-marked above. Wings 

 grayish fumose, scarcely darker on tip, venation black, margin not swollen. 

 The large bristles each side on thorax are black. The hind femora have 

 no spine-like bristles beneath in the male, but in the female there are stiff 

 black bristles beneath on basal half of hind femora ; the hind tibi» has 

 one very long bristle above near base and several beyond the middle, one 

 of these also very long ; there are three pjirs of long bristles beneath the 

 metatarsi. 



Length, 13 mm. 



From Palmerlee, Arizona, July (Biederman). 



