Drusilla canaliculata

Drusilla canaliculata (Fabricius, 1787)

(Figs. 155–156)

Staphylinus canaliculatus Fabricius, 1787: 221.

Drusilla cavicollis Casey, 1906: 322, syn. nov.

Drusilla canaliculata: Lohse, 1974b: 222.

Drusilla canaliculata: Muona, 1984: 230.

(Other references are omitted)

Type material. Holotype of Drusilla cavicollis: ♂, “Sitk”, “ Drusilla cavicollis Csy. ”, “TYPE USNM 39494” (red label), “CASEY bequest 1925” (NMNH).

Additional material. CANADA: Ontario: 2 specimens, env. of Ottawa, sifting, iv– v.1998 (V.Grebennikov) (SPSU); Québec: ♂, Dorval, 7.x.1975 (C.Chantal); 3♀♀, Mirabel, 12.vii.1984 (S.Tousignant); ♂, ditto but 20.vii.1984; ♂, Montréal, 22.ix.1968 (E.J.Kiteley); ♂, ditto but 31.v.1969; ♂, ♀, ditto but 1.x.1969; ♂, 2♀♀, ditto but 13.xi.1969; 5♂♂, 3♀♀, ditto but 19.iv.1971; ♂, ditto but 8.v.1971; ♂, ditto but 21.v.1971; ♂, ditto but 5.vi.1971; ♀, ditto but 5.x.1971; ♀, ditto but 20.v.1973; ♂, 2♀♀, ditto but 12.x.1975; ♀, ditto but 21.viii.1977; ♂, ditto but 24.x.1978; ♀, ditto but 23.v.1979; ♂, ditto but 24.ix.1979; ♀, ditto but 27.vii.1980; 2♀♀, ditto but 22.viii.1980; ♂, ditto but 28.iv.1980 (A.Smetana); 2♂♂, 2♀♀, ditto but 5.v.1980; 2♂♂, 4♀♀, Lucerne, pitfall in field, 14–21.v.1983 (L.LeSage); ♀, Gatineau Park, Lac des Fées, pitfall, 14–20.v.1982 (L.LeSage); ♀, ditto but 21–28.v.1982 (F.Rickey, L.LeSage); ♂, Abercorn, Cté de Brome (Y.Bousquet) (CNCI); RUSSIA: Chelyabinsk Reg.: 3 specimens, Isakovo, 8.v.2000 (R.Filimonov) (SPSU); UKRAINE: Kiev Reg.: 3 specimens, env. of Kiev, Pionerskaya metro station, 25.ix.1988 (V.I.Gusarov) (SPSU).

Diagnosis. See Lohse (1974b).

Discussion. The type material of Staphylinus canaliculatus was not examined but this is a well known European species. The holotype of Dr. cavicollis agrees completely with European specimens of Dr. canaliculata in external characters and the shape of the aedeagus, including the sclerites and diverticula of the internal sac (Figs. 155–156).

Distribution. In North America Dr. canaliculata is known from New York (Muona 1984), Ontario, Québec, Kentucky and Alaska and appears to be to be an introduction from Eurasia. In Europe and Siberia Dr. canaliculata is a common species in natural habitats. The fact that the only known Alaskan specimen is known from Sitka and Dr. canaliculata was never collected again anywhere in Alaska, despite numerous collecting trips by Smetana, Campbell and myself, suggests that this species was introduced to Sitka by early Russian colonists, perhaps in ship ballast and never was established in continental Alaska. In eastern North America Dr. canaliculata appears to be restricted to disturbed habitats. This fact also supports the introduction hypothesis.