Identification: Psilosoma audouini : In this species the male hind femora are dilated, and are tuberculate at base beneath, the prothoracic episterna in both sexes are pilose. The female ovipositor is abnormal (see above?), and the sixth tergite has a tubercle on each side at base.(deduced from Collin, 1944)
- Psilosoma audouini est une mouche entièrement orangée avec deux traits noirs sur le thorax. le mâle a le fémur 3 épaissi sur la moitié apicale.
Jessica Joachim has a very useful identification blog at Les carnets nature de Jessica
Shatalkin & Merz reported both Psilosoma spp. as being often swept and observed on large stands of green alder (Alnus viridis)