Peradon bidens

Diagnosis
Body size: male (9–)12–14 mm (single dwarf specimen of 9 mm known, see Notes), female 15–16 mm. Two colour morphs are known of this species. In the red morph (corresponding with the type of Mulio bidens) tergites 2–4 are entirely red. From other species with an entirely reddish abdomen, the red morph of P. bidens differs by the uniformly greyish wings, lacking any pale areas or veins. In the black morph (corresponding with the type of Microdon langi) the abdomen is entirely black. The following combination of characters distinguishes it from other Peradon species with a black abdomen: wings uniformly greyish to blackish, vertex more or less flat, face yellow, mesoscutum with medially interrupted fascia of golden pile along transverse suture, wing cell bm entirely microtrichose, cell br largely bare. In both colour morphs, the wings of the females are generally darker than those of the males.

Distribution
Amazonian. Known from northern states of Brazil (Amapá, Pará), French Guiana, Guyana, Peru and Suriname.