Wiedemannia (Philolutra) chvali Joost

Kustov, Semen & Zherebilo, Danil, 2015, New data on the genus Wiedemannia Zetterstedt (Diptera: Empididae) from the Caucasus with description of four new species, Zootaxa 4032 (4), pp. 351-369 : 356-357

Wiedemannia (Philolutra) chvali Joost

( Fig. 4 )

Wiedemannia (Philolutra) chvali Joost, 1981: 186 .

Material examined. RUSSIA: Karachay-Cherkess Republic, env. Phiya (15), 11.viii.2013, D. Zherebilo (1 ♂); River Kislaya (14), 12.viii.2013, V. Gladun (1 ♂, 2 ♀).

Diagnosis. This species differs by acrostichals extending only to the third dorsocentral seta, 5 pairs of dorsocentrals without intermediate setae interspersed among primary setae, brown scutum with blue pruinescence on notopleuron, fore femur apically without strong anterior setae; clasping cercus broad, mitten-shaped, lobes not slender.

Distribution. Caucasus: Russia (Karachay-Cherkess Republic, Kabardino-Balkaria Republic).

Remarks. In the original description of W. (Philolutra) chvali Joost (1981) the author indicated that acrostichals were absent. However the study of additional specimens shows that they all bear distinct short acrostichal setae, extending to third dorsocentral seta. This species was described from the Karachay-Cherkess and Kabardino-Balkaria Republics of Russia. In the Catalogue of Palaearctic Diptera ( Chvála & Wagner 1989) the species was erroneously indicated from Georgia and we know of no records from this territory. This uncommonly collected species is known from mountain rivers from altitude 1300–2500 m a.s.l. active from June to August.

Figures

FIGURES 1 – 6. Male terminalia of Wiedemannia, lateral view. 1, W. beckeri (Mik); 2, W. braueri (Mik); 3, W. caucasica Joost; 4, W. chvali Joost; 5, W. fallaciosa (Loew); 6, W. ivkovicae sp. nov. Scale bar = 0.1 mm. Abbreviations: cerc pl—cercal plate; cl cerc—clasping cercus, distph—distiphallus, epand—epandrium, hypd—hypandrium, ph—phallus.