Aleochara (Xenochara) tristis Gravenhorst, 1806 New Ontario Record Fig. 4Map 4 genitalia in Klimaszewski (1984)

Material examined.

CANADA: ON:Wellington Co., Guelph, field, 20.ix.1984, Brian Wisenden, 1 (DEBU).

Distribution.

Canada: ON, QC, NB, NL; USA: CA, MN, NE, PA, VT. Widespread in Palaearctic, Oriental and Afrotropical Regions (Horion 1967; Moore and Legner 1975; Klimaszewski 1984; Klimaszewski and Cervenka 1986; Byers et al. 2000; Smetana 2004; Klimaszewski et al. 2005b; Klimaszewski et al. 2011). Adventive in Canada.

Comments.

Aleochara tristis was intentionally released in the United States in 1965 to control populations of Face Fly ( Musca autumnalis DeGeer), a nuisance pest of and disease vector for livestock, which breeds in their dung (Jones 1967). In terms of biological control, the introduction appears to be a failure as this species is rarely collected and only as singletons. However, it is most certainly established in northeastern North America at low densities (Klimaszewski et al. 2005b, this study).