Wiedemannia ( Chamaedipsia ) beckeri (Mik)

Wiedemannia ( Chamaedipsia) beckeri (Mik) View in CoL

( Fig. 1 View FIGURES 1 – 6 )

Chamaedipsia beckeri Mik, 1889: 71 View in CoL .

Material examined. RUSSIA: Krasnodarskiy Territory, Nature Reserve “Kamyshanova Polyana” (5), 24.vi.2013, S.Yu. Kustov (1 ♀); same data, 24.vi.2013, S. Kustov ( 1 ♂); same data, 3.v.2015, S.Yu. Kustov, D. Zherebilo ( 1 ♂, 1 ♀). GEORGIA: Khevsureti (48), 21.vii.2014, D. Zherebilo ( 1 ♂); Samtskhe-Javakheti (29), 20.iv.2014, D. Zherebilo ( 2 ♂ 2 ♀); Lechkhumi Ridge (41), 29.iv.2014, D. Zherebilo ( 1 ♂); env. Lahepa (23), 29.iv.2014, D. Zherebilo ( 1 ♂, 2 ♀); Mingrelia (28), 2.v.2014, D. Zherebilo ( 5 ♂, 3 ♀); ridge Ofitsari (32), 5.v.2014, D. Zherebilo ( 1 ♂); Shavsheti ridge (24), 4.iv.2015, A.V. Zherebilo ( 1 ♂, 1 ♀); env. Chinkadziebi (25), 6.iv.2015, A.V. Zherebilo ( 1 ♂); env. Zedakinchha (34), 9.iv.2015, A.V. Zherebilo ( 1 ♂, 1 ♀); env. Chkumi (36), 11.iv.2015, A.V. Zherebilo (1 ♀). ABKHAZIA: env. Sukhum (18), 27.vi.2013, D. Zherebilo ( 1 ♂); River Bzyb (11), 11.vii.2013, D. Zherebilo ( 3 ♂, 1 ♀); River Pshitsa (9), 11.vii.2013, D. Zherebilo ( 1 ♂).

Diagnosis. This species differs by acrostichals divergent around the prescutellar depression, 5 pairs of dorsocentrals with interspersed shorter setae, olive-brown scutum (postpronotal lobe and lower margin of notopleuron slightly lighter) with triangular patch of blue pruinescence on prescutellar depression, fore femur apically without strong anterior setae; clasping cercus unilobed, elongated, broader basally and narrowed to apex.

Distribution. PALAEARCTIC: Europe: Austria, Bosnia and Herzegovina, French mainland, Germany, Hungary, Italian mainland, Poland, Romania, Slovakia, Slovenia, Switzerland; Caucasus: Russia (Krasnodarskiy Territory), Abkhazia, Georgia.

Remarks. Joost (1981) first reported this species from the Caucasus, collected the stream Yusengi ( Russia: Kabardino-Balkaria Republic). In the Catalogue of Palaearctic Diptera ( Chvála & Wagner 1989) , this species was mistakenly indicated only from the territory of Georgia. Therefore W. ( Chamaedipsia) beckeri is noted from the territories of Georgia and Abkhazia for the first time. Wiedemannia beckeri is common from mountain rivers of the Caucasus from elevations between 360–2830 m a.s.l. and is active from April to July.