Milichiella nigripes
Content
Description
Body length: 2-2.7 mm; wing length: 2.7-2.8 mm.
Male coloration and vestiture: frons subshiny black, ocellar triangle and orbital plates shiny black, lunule black, basoflagellomere black, face brown microtomentose, palpus black; thorax with mesonotum shiny black, scutellum and pleura brown microtomentose, wing hyaline, veins brown, brown spot at tip of vein R1 weak, calypter brown with dark margin, halter black, legs black except for yellow basitarsi, fore and hind tarsus with yellow brush; abdomen with T2-5 silvery microtomentose except for anterolateral corner of T2 and shiny black posterolateral corner of T5.
Morphology. Head: frons with 2 orbital and 2+0.5 frontal setae, middle frontal seta medioclinate. In males frons 2.3x as wide at posterior margin than at base of antenna, arista about 3.5x as long as basoflagellomere wide, pubescence on arista very short, posterior eye margin with notch (5-6oc), narrow emargination (1-2oc).
Thorax: 2 dc, 1 prsc, 1 pprn, 2+0.8 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 (2.7), and ultimate section of vein M1 1.6x 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 with more than 3 lines of setae, T2-5 posterior margin with 2 rows of scarce setulae; T5 shiny parts with long setae. S5 about 1.1x as long as wide, about 1.9x as long and 2.5x as wide as S4, setulose, posterior margin indented. Male genitalia with apical seta on cercus longer than epandrial setae, 1 seta on subepandrial plate, surstylus 0.6x as long as epandrium high, dilated posteroapically (1.5x), 1.9x as long as wide, structure of lateral surface smooth, medial surface with 3-5 setulae along anterior margin moving medially basally.
Special characters: pair of 0.7 setae between poc and second 0.5 pair of setae on ocellar triangle.
Male coloration and vestiture: frons subshiny black, ocellar triangle and orbital plates shiny black, lunule black, basoflagellomere black, face brown microtomentose, palpus black; thorax with mesonotum shiny black, scutellum and pleura brown microtomentose, wing hyaline, veins brown, brown spot at tip of vein R1 weak, calypter brown with dark margin, halter black, legs black except for yellow basitarsi, fore and hind tarsus with yellow brush; abdomen with T2-5 silvery microtomentose except for anterolateral corner of T2 and shiny black posterolateral corner of T5.
Morphology. Head: frons with 2 orbital and 2+0.5 frontal setae, middle frontal seta medioclinate. In males frons 2.3x as wide at posterior margin than at base of antenna, arista about 3.5x as long as basoflagellomere wide, pubescence on arista very short, posterior eye margin with notch (5-6oc), narrow emargination (1-2oc).
Thorax: 2 dc, 1 prsc, 1 pprn, 2+0.8 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 (2.7), and ultimate section of vein M1 1.6x 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 with more than 3 lines of setae, T2-5 posterior margin with 2 rows of scarce setulae; T5 shiny parts with long setae. S5 about 1.1x as long as wide, about 1.9x as long and 2.5x as wide as S4, setulose, posterior margin indented. Male genitalia with apical seta on cercus longer than epandrial setae, 1 seta on subepandrial plate, surstylus 0.6x as long as epandrium high, dilated posteroapically (1.5x), 1.9x as long as wide, structure of lateral surface smooth, medial surface with 3-5 setulae along anterior margin moving medially basally.
Special characters: pair of 0.7 setae between poc and second 0.5 pair of setae on ocellar triangle.
Diagnosis
Differs from congeners in the combination of shiny black mesonotum, dark calypter and silvery microtomentose male T2-5.
Citation
Australasian/Oceanian catalog (Sabrosky 1989: 78. Family: Milichiidae, pp. 555-557. – In: Evenhuis, Catalog Diptera, Australian and Oceanian Regions 86: 557)
type information (Lee, D.J., Crust, M. & Sabrosky 1956: The Australasian Diptera of J. R. Malloch. – Proc. Linn. Soc. N.S.W. 80: 289-?: 326)