Trebacosa marxi (Stone, 1890)

(Figs 1–4, 23)

Pirata piraticus Emerton, 1885: 492, pl. 48, fig. 7 (misidentified). Pirata marxi Stone, 1890: 429, pl. 15, fig. 1

Trebacosa marxi, Dondale & Redner 1981: 109, f. 1–4

Trebacosa marxi, Dondale 2005: 166, 326, f. 37.7–37.8.

Trebacosa marxi, Szinetár & Kancsal 2007b: 155, figs 2, 4, 6, 8, 10, 12, 14. Trebacosa marxi, Villepoux 2007: 4, fig. 3.

See Dondale & Redner (1981) and World Spider Catalog (2016) for previous citations.

Diagnosis. Males of Trebacosa marxi can be differentiated from those of T. europaea by the massive and wide median apophysis, 1.2 times longer than wide (Fig. 23, see also Szinetár & Kancsal 2007b: fig. 6; Dondale & Redner 1981: fig. 2). Females can be distinguished by the large vulval chamber, which has a diameter about twice as large as the head of spermatheca (Fig. 4).

Material examined. CANADA: Ontario: Oliver Bog, 3 km S. Galt, June–July 1987, pitfall trap, D. Blades coll, 1 male, 1 female (CASENT) . USA: Massachusetts: Quisett, shrub sphagnum, 1981, 1 male, 1 female (CASENT).