Amaurosoma bernasconii sp. nov.

(Figs. 4-7) Type material. HOLOTYPE: ♁, CZECH REPUBLIC: MORAVIA mer., Rokytná near Moravský Krumlov (6963), deciduous forest, 20.v.1986, F. Šifner leg. ALLOTYPE: ♀, same data as holotype (coll. Šifner).

Description. Body length 4-5 mm, primary colour black.

Head. Posterior portion of head dark and slightly grey dusted, orbits, upper part of parafacialia, and frontal vitta black, a strip in front of frontal vitta yellowish brown, entire antennae black, arista bare, second aristomere slightly prolonged, arista thickened to half of its length, face, lower part of parafacialia and genae yellowish white, palpi yellow without distinct hair bristles. Vibrissal callus with two bristles and one short bristle between them.

Thorax. Acrostichal bristles very sparse or almost absent, two scutellar bristles very long at their midlength arched outside, other chaetotaxy standard. All legs yellow, fore femora without short bristles at inner side, wings hyaline, all veins distinct and dark.

Abdomen. Male – sternite 3 narrow and long, sternite 4 rectangular and slightly narrowed proximally, lobes of sternite 5 straight, with short bristles medially (Fig. 4), surstyli only slightly arched, at inner side with bristles, cerci short and narrow (Fig. 5), praegonite narrow, slightly arched apically with one long, almost perpendicular, lateral bristle (Fig. 6). Female – sternites 4-6 long and rectangular, without distinct bristles, sternite 7 oval, wide, with an incision and four bristles caudally, sternites 8 small and pointed caudally (Fig. 7).

Differential diagnosis. Amaurosoma bernasconii sp. nov. differs from the related A. brevifrons in the following characters: A. bernasconii sp. nov. – male: abdominal sternite 4 rectangular, praegonite with one long, almost perpendicular, lateral bristle; female: abdominal sternite 7 oval with caudal incision (Figs. 4-7). Amaurosoma brevifrons – male: abdominal sternite 4 oval, praegonite with two short bristles; female: abdominal sternite 7 oval, without incision.

Etymology. The species is dedicated to my colleague, Swiss entomologist and molecular biologist Marco V. Bernasconi (Zoologisches Museum, Universität Zürich, Switzerland).

Distribution. Czech Republic (southern Moravia).