1. Boreus chadzhigireji Pliginsky, 1914

(Fig. 5)

Boreus chadzhi-gireji [sic!]: Pliginsky, 1914: Rus. Entomol. Oboz., 14: 366, figs. 9–13 [description; distribution]

Boreus chadzhi-gereji Plig. [sic!]: Martynova 1954: 61 [morphology, taxonomy, key, distribution]

Boreus chadzhigireji Plig.: Dorokhova and Martynova 1987: 100 [morphology, taxonomy, key, distribution]

Boreus chadzhigireji Pliginsky, 1914: Svensson 1972: 26 [distribution]; Penny 1977: 203 [taxonomy; distribution]; Nikolaev 2015: 196 [distribution]

Boreus navasi Pliginski, 1914: Nikolaev, 2015: 196 [distribution]

Boreus aktijari Pliginsky, 1914: Rus. Entomol. Oboz., 14: 367 [description, distribution; synonymy tested by Penny 1977: 210]; Svensson 1972: 26 [taxonomy, distribution]; Nikolaev, 2015: 196 [distribution]

Boreus navasi Pliginsky, 1914: Rus. Entomol. Oboz., 14: 364, figs. 1–8 and 14 sub. B. aktijari [description, distribution]; Svensson 1972: 28 [taxonomy, distribution]; Penny 1977: 210 [taxonomy, distribution]

Boreus navasi Plig.: Dorokhova and Martynova 1987: 101 [morphology, taxonomy, key, distribution]

Published records: Crimea [Crimean Peninsula], Sevastopol, Simferopol and Evpatoriya, (Pliginsky 1914; Martynova 1954; Svensson 1972; Penny 1977; Dorokhova & Martynova 1987; Willmann 2013; Nikolaev 2015).

Remarks: Reported as an endemic of the Crimea and originally described from the plain and foothill part of the peninsula by Pliginsky (1914). Later, Martynova (1954) studied most of the type series of B. chadzhigireji housed in the collection of ZIN RAS (former ZIN AS USSR) and drew conclusions about the similarity of all species described from Crimea. Nevertheless, the author refrained from bringing all names into synonymy because of the absence of the type series of B. navasi and B. aktijari . Nikolaev (2015) suggested the possibility of the distribution of the species also in the Caucasus, and considered B. navasi and B. aktijari as junior synonyms of B. chadzhigireji (Nikolaev 2003, 2015).