Dolichopus umbrosus Van Duzee, 1921: 100

Runyon, Justin B., 2022, Nematode-induced demasculinization of Nearctic Dolichopodidae (Diptera) with five new synonyms, Zootaxa 5092 (5), pp. 545-558 : 555

Dolichopus umbrosus Van Duzee, 1921: 100

Potential demasculinized species: unknown.

Dolichopus umbrosus was described from one male from Wisconsin, USA. Signs of nematode infection include the male having a wide face and a very small hypopygium with dark yellow cerci. Illustration of the genitalia ( Van Duzee et al. 1921, fig. 57a) suggests they are not fully rotated and not centered beneath the abdomen. This species is also reported from Ontario, Canada ( Pollet et al. 2004). Dissection of material from Ontario could determine if this species is demasculinized and might identify the host species, if collected with the unparasitized counterpart.