Dasyllis sackeni n. sp.--Black; the hair in front of the halteres and in front of the wings is wholly black; head yellow haired except black on vertex behind; legs wholly black haired; thorax yellow haired above, scutellum black haired; abdomen black, but with a band of yellow just before tip, leaving the apical segment black. Superior appendages slightly excavated behind, lower edge deeply rounded. Length 15 to 17 mm.
From Brookdale and Walnut Creek, Calif. (Davidson); and San Francisco and Contra Costa, calif. (Edwards).
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