Genus Cheilosia Panz. (1809).

Rather robust flies, more or less rectangular in outline; wings sometimes not extending beyond abdomen; eyes bare or hairy, holoptic or dichoptic in the male, broadly dichoptic in the female; head more or less rectangular in profile; face with a prominent central knob; antennae of species described below lying flat on face, the 3rd joint orbicular; legs at times peculiarly haired, the anterior and posterior tibiae and tarsi sometimes broadened.

Two of the four new species described below—C. howesii and C. leptospermi—are represented one by a female and the other by a male; they are singularly similar in many respects—so much so that they might readily be taken for the one species. However, I think there is sufficient reason to separate them, mainly on the character of the anal angle and alula of the wing, which are so markedly different in the two. The other two species are quite distinct.

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