Malloch — Seven New Species of Sphegina Meigen (Diptera) . 143 



Frons of male about three times as long as wide, in female about twice 

 as long as wide, very short haired; arista pubescent, thickened on basal 

 fourth. Scutellum short and wide, over twice as wide at middle as its 

 median length, apex subtransverse, the two long hairs very widely sepa- 

 rated. Abdomen constricted near base of first tergite, the latter not as 

 long as the next two combined, fourth (fifth) tergite in female deeply 

 notched in center of hind margin; fifth sternite of male with the left hind 

 angle produced into a rounded lobe which is gray pruinescent apically, the 

 hairs setulose. Hind femora stout, hind tibia not produced at apex ven- 

 trally, basal segment of hind tarsus slightly thicker than apex of tibia. 

 Outer cross-vein as long as its distance from bend of fourth vein. 



Length, 5.5-6.5 mm. 



Type and allotype. — Dewatto, Wash., June 7, 1906. Paratypes, one male, 

 Longmire Springs, Mt. Rainier, Wash., August 2, 1905, one female, Wash- 

 ington State. The first three taken by Dr. J. M. Aldrich, and the last one 

 from the Williston collection identified and recorded by Williston as riifi- 

 ventris Loew. I have not seen the latter from the west. 



Sphegina biannulata, sp. n. 



Female. — A black and yellow species closely resembling flavimana, the 

 humeri, sides of mesonotum and scutellum, bases of second and third ter- 

 gites and all of fourth, and all of fore and mid tarsi yellow ; hind femur with 

 two black bands, one just beyond middle and the other at apex. 



The curved linear thoracic depression is practically absent, and in general 

 this species is similar to rufiventris. 



Length, 5.5 mm. 



Type. — Virginia near Plummers Island, June 2, 1916, on flowers of 

 Aruncus aruncus (W. L. McAtee). 



Sphegina flavimana, sp. n. 



Male. — Similar to keeniana Williston in color, but the humeral angles of 

 thorax are pale yellow, and the fore and mid tarsi are pale yellow, with the 

 apical two segments rarely brownish. 



Structurally similar to that species, the hind tibia slightly scoop-like at 

 apex ventrally, and the abdomen the same in general form, but the fifth 

 sternite lacks the short stubby spinules that cover a large part of the disc 

 in that species. 



Female. — Agrees in color with the male. 



Length, 5.5 mm. 



Type. — Male, Maryland near Plummers Island, May 28, 1916 (H. L. 

 Viereck). Allotype, Lafayette, Ind., July 30 (J. M. Aldrich). Paratypes, 

 3 males, Maryland near Plummers Island, May 28-29, 1916 (H. L. Viereck), 

 two males, Lafayette, Ind., May 11, 1918, and June 29, 1916 (J. M. Aldrich) ; 

 1 female. Glen House, N. H., named lobata Loew by Williston; one female, 

 Ithaca, N. Y.. June (R. C. Shannon), and 1 male Tallulah Falls, Ga., June, 

 1909 (J. C. Bradley). 



