Archimicrodon was proposed for those Australasian species of Microdon which have antennae short, "quite short and are about as long as in some species of Syrphus", which were considered a primitive character by Hull (1945a, 1949). Some Afrotropical species, like brevicornis Loew, may also belong here (Cheng and Thompson 2008).
From original description (Hull 1937).
MALE.
Head rounded in profile; similar to Microdon investigator. Front narrowest above antennae, but the sides nearly parallel, diverging toward the vertex. Antennae, face, front and vertex black, the latter shining. Antennae short, scape and basoflagellomere subequal, either twice the length of pedicel. Arista short, much thickened basally, reaching just past basoflagellomere. Pile of head everywhere pale yellowish to whitish, sparse.
Thorax and scutellum everywhere shining black. Pile sub-appressed, sparse, yellowish to golden. Scutellum evenly rounded, a little more pointed centrally, without spines, margins, dentations, etc. Halteres brown. Legs light brown except for the middle of all the femora, and quite small maculae in the middle of each tibiae. Metabasitarsomere not at all thickened. Wings rather uniformly suffused with brown, lighter in the cells R4+5, DM, and R. Termination of vein M straight, nearly rectangular, angle of cell DM rounded. Appendix of R4+5 present, spurious vein not prominent. Angle of cell R4+5 spurred to near by wing margin.
Abdomen: First and fourth abdominal segments brown to black, obscurely shining; second and third pale brownish yellow, the second the palest, subtranslucent. Pile very short except on the lateral margins of the second segment where it is long and golden. Pile black or brown elsewhere, except on the posterior lateral angles of the third segment where it is golden.
Microdon (Archimicrodon) digitator Hull, 1937.
Hull, F.M. (1937) New species of exotic syrphid flies. Psyche 44, 12-32, pl. 2.
Archimicrodon was proposed for those Australasian species of Microdon (Microdon digitator) which have antennae short, "quite short and are about as long as in some species of Syrphus", which were considered a primitive character by Hull (1945a, 1949). Some Afrotropical species, like brevicornis Loew, may also belong here (Cheng and Thompson 2008).
unless otherwise stated