Milichiella dimidiata
Differs from congeners in the combination of brown microtomentose frons and mesonotum, brown calypter, wing hyaline with brownish tinge and T2-5 silvery microtomentose except for subshiny black tip of T5 and brown microtomentose line between silvery and black part.
Male coloration and vestiture: frons brown, ocellar triangle and orbital plates brown microtomentose, lunule brown, basoflagellomere black, face greyish microtomentose, palpus black; thorax with mesonotum brown microtomentose, scutellum same, pleura dorsally brown microtomentose anteroventrally dark grey microtomentose, wing hyaline with slight brownish tinge, veins brown, brown spot at tip of vein R1 absent, calypter brown, halter black, legs black except for orange bases and tips of tibiae, and yellow basitarsi; abdomen with T2-5 silvery microtomentose, except for brown microtomentose middle and black subshiny tip of T5; margin between silvery and brown parts gradual.
Morphology. Head: frons with 2+0.3 orbital and 2 frontal setae, anterior frontal seta medioclinate. In males frons 2.3x as wide at posterior margin than at base of antenna, arista about 4.8x as long as basoflagellomere wide, pubescence on arista very short, posterior eye margin with notch (4oc) and emargination (2oc).
Thorax: 2 dc, 1 prsc, 1 pprn, 1 prs, 2 keps setae, posterior prsc less than 0.8x as long as posterior dc, seta between posterior prsc and posterior dc absent. Wing with vein R4+5 and M1 nearly parallel (1.3), and ultimate section of vein M1 3.0x as long as penultimate section. Fore femur normal setulose, tibial organ absent.
Male abdomen: posteromedial triangular projection of T1 into T2 ?. Tergal chaetotaxy: T2 anterolateral corner with 2-3 lines of setae, T2-4 posterior margin with 1 row of setulae, line of long setae along crease. S5 1.8x as long as wide, 1.7x as long and 1.3x as wide as S4, posterior margin indented, setulose, strongly setulose at posterior margin. Male genitalia with apical seta on cercus as long as longest epandrial setae, 1 seta on subepandrial plate, surstylus 0.6x as long as epandrium high, dilated posteroapically (1.3x), 2.3x as long as wide, structure of lateral surface smooth, medial surface with row of 4-5 long setae near anterior margin.
Body length: 2 mm; wing length: 2.3 mm.
Species in the dimidiata-group are characterized by the combination of T5 anteriorly silvery microtomentose, middle brown microtomentose, tip shiny; S5 elongate with lateral sides parallel; surstylus with long setulae along anterior margin, line not moving medially.