Milichiella montana
Content
Description
Body length: 2.5-3 mm; wing length: 2.9-3.2 mm.
Male coloration and vestiture: frons brown, ocellar triangle and orbital plates brown microtomentose, lunule black, basoflagellomere black, face black microtomentose, palpus black; thorax with mesonotum slightly brown microtomentose, scutellum and pleura same except for polished spot on anepisternum, wing hyaline, veins brown, brown spot at tip of vein R1 absent, calypter light brown with brown margin, halter black, legs black; abdomen with T2 brown microtomentose except for silvery posterior margin and lateral sides, T3-5 silvery microtomentose; ventrally bent tip of T5 silverwhite.
Morphology. Head: frons with 3 orbital and 2 frontal setae, anterior frontal seta medioclinate. In males frons 2.0x as wide at posterior margin than at base of antenna, arista about 5.6x as long as basoflagellomere wide, pubescence on arista very short, posterior eye margin with notch (4oc) and emargination (1-2oc).
Thorax: 3+1 dc, M:3+1 prsc, 1 pprn, 1 prs and row of 0.6 setae, 2+0.8 keps setae, posterior prsc about as long as posterior dc, seta between posterior prsc and posterior dc absent or small. Wing with vein R4+5 and M1 very weakly converging (1.6), and ultimate section of vein M1 2.9x as long as penultimate section. Fore femur slightly 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 setulose, T3-5 posterior margin with 1-2 row of setulae, T5 with row of setae anterior to silvery tip. S5 same as M. frontale. Male genitalia same as M. frontale, 1 seta on subepandrial plate, surstylus same as M. frontale, structure of lateral surface smooth, medial surface without setulae.
Special characters: orbital plate extends into frons as acute medioventral tip.
Male coloration and vestiture: frons brown, ocellar triangle and orbital plates brown microtomentose, lunule black, basoflagellomere black, face black microtomentose, palpus black; thorax with mesonotum slightly brown microtomentose, scutellum and pleura same except for polished spot on anepisternum, wing hyaline, veins brown, brown spot at tip of vein R1 absent, calypter light brown with brown margin, halter black, legs black; abdomen with T2 brown microtomentose except for silvery posterior margin and lateral sides, T3-5 silvery microtomentose; ventrally bent tip of T5 silverwhite.
Morphology. Head: frons with 3 orbital and 2 frontal setae, anterior frontal seta medioclinate. In males frons 2.0x as wide at posterior margin than at base of antenna, arista about 5.6x as long as basoflagellomere wide, pubescence on arista very short, posterior eye margin with notch (4oc) and emargination (1-2oc).
Thorax: 3+1 dc, M:3+1 prsc, 1 pprn, 1 prs and row of 0.6 setae, 2+0.8 keps setae, posterior prsc about as long as posterior dc, seta between posterior prsc and posterior dc absent or small. Wing with vein R4+5 and M1 very weakly converging (1.6), and ultimate section of vein M1 2.9x as long as penultimate section. Fore femur slightly 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 setulose, T3-5 posterior margin with 1-2 row of setulae, T5 with row of setae anterior to silvery tip. S5 same as M. frontale. Male genitalia same as M. frontale, 1 seta on subepandrial plate, surstylus same as M. frontale, structure of lateral surface smooth, medial surface without setulae.
Special characters: orbital plate extends into frons as acute medioventral tip.
Diagnosis
Differs from congeners in the brown microtomentose male T2 except for silvery posterior margin and lateral sides, silvery microtomentose T3-4; tip of T5 silverwhite.
Distribution
Southern America: Caribbean (Puerto Rico present); Southern South America (Chile Central (Coquimbo present, Santiago present), Chile North (Tarapaca present)); Western South America (Bolivia present, Peru present)
Citation
Neotropical catalog
Puerto Rico (Wolcott 1951: Milichiidae. In: The insects of Puerto Rico. Diptera, two-winged flies. – J. Agric. Univ. P.R. 32(1948): 529-530: 529 (as Eccoptomma montanum))
checklist, Puerto Rico (Wolcott 1936: "Insectae Borinquenses." A revision of "Insectae Portoricensis.". – J. Agric. Univ. P.R. 20(1): 627+[3]pp: 391 (as Eccoptomma montanum))
checklist, Chile (Ortiz 1946: Catalogo de los dipteros de Chile: 250pp: 142 (as Eccoptomma montanum))
type information (Hennig 1941: Verzeichnis der Dipteren von Formosa. – Ent. Beih. Berl.-Dahlem 8: iv+239: 444 (as Eccoptomma montanum))
description, Puerto Rico (Curran, C.H. 1928: Insects of Porto Rico and the Virgin Islands. Diptera or two-winged flies. – Scient. Surv. P. Rico 11: 1-118: 66 (as Eccoptomma montanum))