Nematode-induced demasculinisation of Dolichopus males (Diptera: Dolichopodidae) Author Kahanpää, Jere text Zootaxa 2008 1689 51 62 journal article 10.5281/zenodo.180614 549e79e9-bf81-4d14-9633-8af319a5c9dd 1175-5326 180614 Dolichopus longitarsis Stannius, 1831 Dolichopus longitarsis Stannius, 1831 : 124 Dolichopus kowarzianus Stackelberg, 1928 : 268 syn. nov. Demasculinised males examined: Coll. JK — Finland , 3ɗ Obb: Tervola, Hirviaapa (73475:34184), 8.vii. 2006 , J. Kahanpää, id jka06-01355, -65, -67. Dolichopus kowarzianus is closely related to D. longitarsis and differs from it by the broad face, the absence of ventral hairs on hind femora and the lack of a well-developed pterostigma ( Stackelberg 1930 ). The hypopygium is rather small with small cerci. The type locality of D. kowarzianus is Františkový Láznĕ in western Czech Republic ( Negrobov 1991 , Olejníček 1997 ). Three males matching the description of this species were collected from Tervola together with numerous males of D. longitarsis . All three were found to be parasitised. The differential diagnosis given by Stackelberg involves only characters typical for nematode-induced demasculinised males. D. kowarzianus Stackelberg, 1928 is here synonymised with D. longitarsis Stannius, 1831 .