Peradon elongatus (Hull) Figs 28, 29, 33, 107, 108, 191-193, 187-193, 263

Microdon elongatus Hull, 1943: 706. Holotype ♂: Brazil, Pará (NHMUK) [examined].

Argentinomyia elongata (Hull): Thompson et al. 1976: 57.

Peradon elongatus (Hull): Reemer and Ståhls 2013a: 145.

Studied type specimens.

Brazil • 1 ♂, holotype of Microdon elongatus Hull; Pará, Santarem; NHMUK. Label 1 (small, round, red-bordered): "Holo- / type"; label 2: "Braz. / Santarem"; label 3 (red): "Holotype / Microdon /elongata / Hull". Coll. NHMUK. • 1 ♀; Villa nova; NHMUK. Label 1 (small, round, yellow-bordered): "Para- / type"; label 2: "Villa / nova"; label 3 (yellow): "Paratype / Microdon / elongata / Hull".

Additional specimens.

Brazil • 1 ♂; Amazonas, Novo Aripuanã, Malaise Igarapé, "Floresta úmida”; 05°15'53"S, 60°07'08"W; Sep. 2004; Henriques, Silva & Pena leg.; INPA (" INPA-DT / 0000080") • 1 ♀; Amazonas, Parque Nacional Jaú, Arm. Malaise, Campinarana baixa; 8-16 Apr. 2001; 01.5427 S, 61.3510 W; Henriques & Vidal leg.; INPA (" INPA-DIP / 001569").

Diagnosis.

Body length: male 10.5-11 mm, female 11-12 mm. The basally constricted abdomen, absence of a golden pilose triangle on the mesoscutum, and partially infuscated wings place this species in a group together with P. diaphanus, P. hermetia and P. hermetoides . Among these species, P. elongatus is the only one with yellow colouration on the wing: in the male, only the vena spuria is yellow, in the female the yellow parts are more extensive.

Distribution.

Brazil (Amazonas, Pará).

Notes.

The yellow wing colouration is much more extensive on the female than on the male. Similar sexual dimorphism in wing colouration also occurs in other Peradon species, e.g., P. chrysopygus and P. flavofascium . The male from the Brazilian state Amazonas was collected in humid forest along a small stream ( “igarapé”). The female from Amazonas was collected in a “campinarana”: a type of vegetation occurring in flat, sandy soils prone to waterlogging, usually dominated by thin trees (pers. comm. G.F.G. Miranda).