Hahniidae, Bertkau, 1878

Hahniidae View in CoL

3) Mastigusa arietina (Th orell, 1871) – this scattered species occurs rarely in warm habitats, especially open forests ( Fig. 1 View Fig 1 ) and on xerothermic slopes. Th ey live under bark or in formicaries ( Nentwig et al., 2020).

Host ants: in the nests of the ants Lasius brunneus and L. fuliginosus ( Brian, 1977) . Th ey are not speci ed in the literature, it obviously may live together with a large range of ant species.

New recent records: Jalovec (49°09ʹ28.00ʺ N, 19°37ʹ54.70ʺ E, 768 m a. s. l.), in the colony of Formica rufa near the chapel ( Fig. 1 View Fig 1 ), March 10, 2019, 1 ♀ and 2 juveniles V. Franc and V. Hemala lgt. Th is mountain record at the foot of the Západné Tatry Mts   GoogleMaps is highly notable!; Banská Štiavnica – the ‘Little Water Dam’ (48°28ʹ05.48ʺ N, 18°53ʹ03.94ʺ E, 778 m a. s. l.), in the colony of F. rufa in mixed forest February 14, 2020, 1 ♀ and 1 juvenile, V. Franc and V. Hemala lgt. et coll.

Th e following records from Slovakia are available, for example: the Rohy National Nature Reserve near the town of Detva (7482a/c), in a under-stone colony of Lasius niger , March 3, 1991, 1 ♂; the village of Plášťovce (7879b), in the colony of Messor muticus Nylander , on a xerothermic slope, April 1, 1994, 2 ♀ [together with the very rare leiodid-beetle Attaephilus arenarius Hampe !]; the Rykynčice village (7779d), in the same circumstances, April 9, 1994, 2 ♂, 1 ♀, all records V. Franc and A. Hanzelová lgt.; the village of Nedelište (7682a/b), in a colony of Lasius alienus Foerster in a xerothermic oak forest, April 22, 2000, 1 ♂ V. Franc lgt. ( Franc, 2007); the Zobor National Nature Reserve near the town of Nitra (7674), April 29, 1978 ( Gajdoš, Krumpál, 1987); Jurský Šúr surroundings: Malé Nové Hory (7769), April 2009 – 2011 ( Dankaninová, Gajdoš, 2012); Ruské (49°7.970ʹ N, 22°20.443ʹ E, 568 m), 1 ex ( Žila, Gajdoš, 2015). Identi ed also in undated records from the Slovenský kras Mts. (060) J. Svatoň lgt. ( Gajdoš et al., 1999) and the Urpín hill near the town of Banská Bystrica (7280d) ( Svatoň, 1985).