Chorthippus dichrous (Eversmann, 1859)

Holuša, Jaroslav, Kočárek, Petr, Vlk, Robert & Marhoul, Pavel, 2013, Annotated checklist of the grasshoppers and crickets (Orthoptera) of the Czech Republic, Zootaxa 3616 (5), pp. 437-460 : 449

Chorthippus dichrous (Eversmann, 1859)

This species has been reported from two localities (Hodonín, Bzenec) in the CR (Ginter 1977; Chládek 1984) but we have not seen any specimens. There is no specimen in Ginter´s collection. The species was relatively abundant during the period of 1971-1973 at Pánov near Hodonín (Ginter 1977), where it inhabited the margins of a small swamp that was surrounded with sand dunes (a military training area) (Ginter in litt.). It has not been found recently at the published localities despite many hours of sweeping and surveys carried out by several persons.

This species is distributed from northern Italy, Austria, Hungary, Dalmatia, Bulgaria, and Romania through Turkey and Middle Asia to Mongolia and western Siberia (Kočárek et al. 2005). Czech localities could be situated on the northern edge of its distributional range, which also reaches southeastern Slovakia (Mařan 1954; Görtler 1951). In Hungary, it is rare, having been found in only 3.5 % of the studied fields (Rácz 1998). The distribution of this species has expanded recently, as indicated by findings of single specimens on the foothills of the Strážovské vrchy hills in Slovakia (Gavlas 1999). In Austria, it is more abundant now than in the past (Zuna-Kratky et al. 2009).

Even though it has not been found recently (Holuša et al. 2007b, d, 2012b; Holuša & Kočárek 2006), this species is evaluated as missing rather than extinct. It probably does not occur at the published localities/ty at present. However, it is a very efficient flier, and so it could spread to the CR from Slovakia or Austria. Localities in Lower Austria (Zuna-Kratky et al. 2009) lie just inside the state border.