Diplotriaena tricuspis (Fedtschenko, 1874) (Nematoda: Diplotriaenoidea) in crows (Corvus brachyrhynchos Brehm) wintering in Ontario

Two hundred and eleven of 4404 (4.8%) crows (Corvus brachyrhynchos) collected in the winters of 1976-77 and 1977-78 in Essex County, southwestern Ontario, were infected with Diplotriaena tricuspis (Fedtschenko, 1874) Henry and Ozoux, 1909. Prevalence of potentially patent infections was only 2.6%, however, as crows often had nematodes of a single sex only. Intensity was 4.0 (1-74) and was similar in both male and female crows of all age groups. Intensity tended to be higher in young-of-the-year crows than yearlings and adults.