Milichiella asiatica has been collected on Elaeis guineensis Jacquin (oil palm, Arecaceae) fruits, on rotting stems of oil palm (Arecaceae), rotting manure, and at light.
Differs from congeners in the combination of brown microtomentose mesonotum and male T2-5 silvery microtomentose except for brown microtomentose spot in middle of T2.
Male coloration and vestiture: frons subshiny black, ocellar triangle and orbital plates with shiny spots, lunule black, basoflagellomere black, face brown microtomentose, palpus black; thorax with mesonotum brown microtomentose, scutellum and pleura same, except for shiny spots on anepisternum and katepisternum, wing hyaline, veins brown, brown spot at tip of vein R1 weak or absent, calypter yellowish white, halter black, legs black except for yellow basitarsi, fore and hind tarsus with yellow brush; abdomen with T2-5 silvery microtomentose except for brown microtomentose spot in middle of T2, anterolateral corner of T2 and shiny black posterolateral corner of T5, in some specimens there is also a smaller brown spot in middle of T3. Female coloration and vestiture: halter yellow, abdomen with T2-4 brown microtomentose, T5 shiny.
Morphology. Head: frons with 2 orbital and 2+0.5 frontal setae, middle frontal seta medioclinate. In males frons 2.0-2.3x as wide at posterior margin than at base of antenna, arista about 4.0-4.6x as long as basoflagellomere wide, pubescence on arista very short, posterior eye margin with wide notch (5-7oc, female: 4-5oc) and emargination (1-3oc).
Thorax: 2 dc, 2 prsc, 2 pprn, 1+0.4 prs, 2 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 (2.1-3.0), and ultimate section of vein M1 1.5-1.8x as long as penultimate section. Fore femur slightly stronger setulose, tibial organ absent.
Male abdomen: posteromedial triangular projection of T1 into T2 present. Tergal chaetotaxy: T2 anterolateral corner with 2-3 lines of setae, T2 posterior margin with 2-3 rows, T3-4 with 1-2 rows of relatively long setulae, T5 silvery part setulose on posterior half with row of relatively long setae near posterior margin, T5 shiny parts with long setae. S5 1.2x as long as wide, 2.0x as long and 2.2x as wide as S4, posterior margin indented, setulose on posterior half. Male genitalia similar to M. unicolor, 1 seta on subepandrial plate, surstylus 0.5-0.8x as long as epandrium high, bent posteriorly, dilated apically (1.6-1.7x), 2.4-3.7x as long as wide, structure of lateral surface smooth, medial surface with 3-5 setulae along anterior margin moving medially basally.
Puparium: elongate, tapering towards anterior and posterior end. Empty puparium reddish brown, subshiny to almost dull, with distinct borders between segments. Anterior (thoracic) part dorsoventrally compressed with shallow but distinct lateral depressions on at least dorsal side. Prothoracic and mesothoracic segments (at least) dorsally with conspicuous ribbed sculpture. Anterior spiracles with 8 spiracular lobes (papillae). Abdominal segments circled by very fine ribs or wrinkles, ventrally each with 1-3 transverse rows of very minute spinulae. Posterior end of puparium more convex and strongly transversely or reticularly (last segment) ribbed. Anus fully visible. Posterior spiracles borne on widely-separated protuberances; each spiracle without peritreme and not on a single plate, but composed of 3 yellowish brown, finger-like projections as described for Milichiella tiefii (Roháček 1995). Each spiracular projection has its own, slightly curved slit and several, little branched and fine, interspiracular processes.
Body length: 2.7-3.5 mm; wing length: 2.7-3.1 mm.