Milichiella tiefii
Differs from congeners in the combination of slightly brown microtomentose mesonotum, 1 pprn, and male abdomen with T2-5 silvery microtomentose except for brown microtomentose anterior 2/3 of T2.
Male coloration and vestiture: frons subshiny black, ocellar triangle and orbital plates shiny black, lunule brown, basoflagellomere black, face greyish microtomentose, palpus black; thorax with mesonotum slightly brown microtomentose, scutellum and pleura brown microtomentose, wing hyaline, veins light brown, brown spot at tip of vein R1 absent, calypter brown with dark margin, halter black, legs black except for brown tarsi; abdomen with T2-5 silvery microtomentose except for brown microtomentose anterior 2/3 of T2, change from brown to silvery gradually.
Morphology. Head: frons with 2 orbital and 2+0.6 frontal setae, middle frontal seta medioclinate. In males frons 1.9x as wide at posterior margin than at base of antenna, arista about 3.2x as long as basoflagellomere wide, pubescence on arista very short, posterior eye margin with notch (5oc) and emargination (2oc).
Thorax: 2 dc, 1 prsc, 1 pprn, 1+0.8 prs and row of shorter setae, 3 keps setae, posterior prsc about as long as posterior dc, seta between posterior prsc and posterior dc present. Wing with vein R4+5 and M1 converging (2), and ultimate section of vein M1 2.2x as long as penultimate section. Fore femur strongly setulose, tibial organ absent.
Male abdomen: posteromedial triangular projection of T1 into T2 present. Tergal chaetotaxy: T2 anterolateral corner mostly with 2-5 lines of setae, T2 posterior margin with 3-4 rows of setulae, T3-4 posterior margins with 1 row of setulae. S5 1.2x as long as wide, 1.7x as long and 1.8x as wide as S4, nearly heart shaped, setulose. Male genitalia with apical seta on cercus longer than epandrial setae, 1 seta on subepandrial plate, surstylus 1.1x as long as epandrium high, bent posteriorly, slightly dilated apically (2.0x), 6.6x as long as wide, structure of lateral surface smooth, medial surface with line of long setae near anterior margin.
Special characters: palpus ventrally with long setae (longer than palpus wide).
Body length: 2.5-3 mm; wing length: 2.7 mm.