Vol. XI] CURRAN— REVISION OF THE PIPIZA GROUP 363 



shorter production and third joint of the antenna? 

 shorter and rounder. 



Male: Length, 5.5 mm. Face and frons shining greenish black, black 

 pilose; face considerably receding, rounded above, sides whitish pollinose, 

 the pollen produced just below the antenna? to form a small triangular spot; 

 frons swollen, opaque above; vertical triangle black pilose, with cinerescent 

 pile across middle; occipital cilia black; antenna? black, third joint with quad- 

 rate yellow spot at base below; only slightly longer than wide, end obtusely 

 rounded; arista black; eyes black pilose, becoming brownish or whitish below. 

 Thorax and scutellum shining black, pile luteous, in front broadly black, 

 especially at the humeral angles where it extends back along sides a short dis- 

 tance, on the pleurae brownish; scutellum with apical groove. Abdomen 

 narrow, thickened, opaque; sides of second segment, more broadly in middle, 

 sides of third, broadly in middle, and sides and apical half of fourth, shining; 

 pile black, on sides in front and the usual areas cinerescent or brownish. Legs 

 black; knees, basal third of front four tibiie and their tips and tarsi yellow, the 

 latter piceous apically; second and third joints of hind tarsi piceous or brown; 

 hind basitarsi slightly thickened; legs wholly black or brownish pilose. Wings 

 cinereous; stigma luteous; last section of fifth vein sub-angulate at its middle; 

 halteres brownish. 



Holotype, male, No. 854, Mus. Calif. Acad. Sci., 

 June 22, 1914 (Curran). Paratype, male, Jordan, Ont., 

 June 15, in collection of the author. 



Type locality, Orillia, Ontario. 



20. Cnemodon calcarata (Loew) (Figs. 4, 5, 6, 8, 49) 



Pipiza calcarata Loew Century, vi. No. 42, 1865; 

 Williston, Synop. N. Am. Syrph., p. 24, 1886. 



Habitat: New York (Lw); Ontario! Mostly whitish 

 pilose, coxal spurs absent, scutellum usually with a 

 shallow apical groove. 



Length, 5.5 to 7 mm. Male: Face and frons shining black, black pilose, 

 middle of face usually with whitish pile; vertical triangle usually whitish pilose 

 behind; apex of the frons opaque; sides of the face and frons narrowly whitish 

 pollinose; antenna? black, third joint subquadrate, not twice as long as wide, 

 yellowish at base below; eyes brownish pilose; occipital cilia black. Thorax 

 and scutellum shining bronze black, whitish pilose, the scutellum with or with- 

 out an apical groove. Abdomen opaque black; sides, an interrupted fascia on 

 third segment and apical half of fourth shining bronze black, the second 

 segment often with large shining lateral spots of similar color; pile whitish, 

 with the usual areas black pilose. Legs black; tips of all the femora, front 

 tibia? and tarsi, except sometimes the apical joints, middle tibia? except a 

 median piceous ring, with first three joints of their tarsi, base of hind tibia?, 

 tip of basitarsi and the following joint, yellow; anterior tibia? with an in- 

 complete brownish or piceous median band; apical joints of the tarsi black or 

 piceous; coxal spur absent, hind trochanteral spur long. Wings cinerescent 

 except the basal third which is hyaline; last section of fifth vein slightly curved 

 at its middle. 



Female: Face entirely white pilose; front blackish pilose, with white 

 pile across middle and at vertex; antenna? black; second and third joints yellow 

 below, third joint large, twice as long as broad. Scutellum usually with an 

 apical groove. Fifth abdominal segment usually wholly white pilose, the 

 black pile on anterior area of third and fourth segments extending only two- 



