Hypselosyrphus plaumanni (Curran, 1940)

Reemer, Menno, 2013, Taxonomic exploration of Neotropical Microdontinae (Diptera: Syrphidae) mimicking stingless bees, Zootaxa 3697 (1), pp. 1-88 : 34-35

Hypselosyrphus plaumanni (Curran, 1940)

Fig 90.

Microdon plaumanni Curran, 1940: 3 .

Studied type specimens. HOLOTYPE. BRAZIL. Female. Label 1: " Microdon plaumanni Curran Holotype "; label 2: " Holotype "; label 3: " Brasilien, Nova Teutonia, 27°11´B, 52°23´L, Fritz Plaumann, 15.2.1937 ". Coll. AMNH.

Additionally studied specimens. BRAZIL: 1 male, Nova Teutonia, 27°11´S, 52°23´W, 300-500 m, 1968, leg. F. Plaumann, coll. RMNH; 2 males, same locality, 12-1970, leg. F. Plaumann, coll. ZMAN; 1 male, same locality, XI.1966, leg. F. Plaumann, coll. CNC; 1 female, E. Rio, Itatiaya, 700 m., 2.XI.1939, leg. J.F. Zikán, coll. USNM.

Redescription (based on holotype)

Adult female Body size: 9 mm.

Head. Face occupying 1/5 of head width in frontal view; black; entirely with long white pilosity except for black pile ventrolaterad of antennal fossa, with lateral strips of white pollinosity along eye margins. Gena black. Oral cavity with lateral margins a little produced. Frons black; black pilose medially, white pilose laterally. Vertex black; black pilose; in profile almost vertical directly anterior to anterior ocellus. Occiput black; with anterior row of dorsally orientated black pile on dorsal 1/3; with poster row of posteriorly orientated pale pile over entire length. Eye entirely with short, pale pile, a little longer than ommati diameter. Antennal fossa about as wide as high. Antenna yellow; antennal ratio 4:1:2; basoflagellomere parallel-sided with narrowly rounded apex, with large oval sensory pit located approximately in middle, occupying about 1/3 of height of basoflagellomere. Arista slender, slightly longer than length of basoflagellomere.

Thorax. Black, a little brownish on pleurae, along posterior margin of scutum and scutellum. Scutum densely black pilose, except for patches of white pile along transverse suture and along posterior margin. Postpronotum and postalar callus black pilose. Scutellum directed upward, deeply sulcate posteriorly, thus leaving two large ‘mammiform’ processes; long black pilose, except white pilose ventrally. Anepisternum a little convex, no clear division between anterior and posterior part; anterior part black pilose, posterior part black pilose along posterior margin. Anepimeron entirely black pilose. Katepisternum black pilose dorsally. Katatergum and anatergum long and short microtrichose, respectively. Other pleurae bare. Calypter dark grey, halter pale brown.

Wing: hyaline, tinged with brown over most of surface, less so posteriorly and apically. Microtrichose, except for basal 1/8 of cells BM and R.

Legs: Front- and mid-femora dark brown, black pilose; hind-femora brown with apical 1/2 yellow, with long black pile. Front- and mid-tibiae yellowish brown, black pilose. Hind-tibia strongly widened, with greatest width in the middle; about 1.5 times as wide as posterior femur; yellow, with long (about as long as maximal width of tibia) yellow pile on basal 1/2, long black pile on apical 1/2. Tarsi yellow, dorsally black pilose on basal two tarsomeres, dorsally yellow pilose on apical three tarsomers; ventrally with dense, short, yellow pilosity. Coxae and trochanters brownish black, with black pile.

Abdomen. Blackish brown. First tergite laterally white pilose. Second tergite white pilose, except for black pile along extreme lateral margins. Tergite 3 short black pilose over most of surface, with longer white pile posterolaterally. Tergite 4 deeply emarginated along posterior margin; black pilose, except white pilose along posterior and lateral margins.; tergite 5 anteriomedially with convex bulge, which fits into the posterior emargination of tergite 4; white pilose. Sternite 1 with long white pile; other sternites with long black pile.

Male. As female, except for usual sexual differences. Genitalia (not drawn) almost identical to those of M. analis .

Diagnosis. A mostly black species with partly bare alula, apicomedially sulcate scutellum and basoflagellomere maximally half as long as scape. Very similar to H. anax . Differences are: tergite and sternite 4 entirely blackish brown, scutellum black pilose, except pale pilose posteroventrally, wing entirely tinged brownish.

Notes. Placed as a synonym of Ubristes flavitibia Walker by Thompson et al. (1976), but here transferred to Hypselosyrphus and reinstated as valid species.

Distribution. Only known from Brazil.