Limonia oosterbroeki sp. nov.

(Figs 5–6)

Type material. HOLOTYPE: ♂ (RMNH), TURKEY: KASTAMONU PROVINCE: Ilgaz Daği National Park, pine forest, 1700 m, 5.viii.1996 (P. Oosterbroek & C. Hartveld leg.), labelled ‘TURKEY, prov. Kastamonu / P.Oosterbroek & / C.Hartveld 1996’ // ‘ILGAZ DAGI MP / Pine forest, 1700 m / 5.VIII.1996 St. 20’ [both printed, white labels] // ‘HOLOTYPE / Limonia / oosterbroeki sp. n. ♂ / J. Starý 2017’ [printed, red label]. The specimen is micro-pinned on a stage of polyporus, with right fore, right mid and left hind leg missing; apex of abdomen cut off, terminalia dissected and placed in a sealed plastic tube with glycerine, pinned with the specimen.

Diagnosis. Medium-sized species. Body colouration pale yellow, with dark brown prescutal stripe. Wing membrane hyaline. Wing pattern with anterior spots small but sharply indicated. Male terminalia with aedeagus of moderate length and breadth and paramere moderately emarginated at posterior margin, with its inner process narrowly rounded at tip. Body length 7.2 mm, wing length 8.5 mm.

Description. Male. Head generally yellow, suffused with pale greyish pruinosity on frons and vertex, shiny on rostrum. Palpus yellow, last palpomere darkened. Antenna 14-segmented, short, not reaching to base of wing. Scape, pedicel, and flagellomeres 1–2 yellow, flagellomere 3 and following segments slightly darkened, with still darker bases. Flagellomeres moderately elongate, subcylindrical. Longest verticils short, subequal in length to their respective flagellomeres.

Thorax generally pale yellow. Pronotum pale yellow, slightly darkened medially. Prescutum and scutum with dark brown stripe medially, otherwise pale yellow, as other dorsal parts of thorax. Pleuron pale yellow throughout. Wing rather narrow, with width-length ratio about 1: 4. Wing membrane hyaline. Wing pattern consisting of three darker spots at anterior margin, comparatively small but sharply indicated, at origin of Rs, at tip of Sc 1, and over R 2, with narrow, darker seams along Cu and all vertical elements, especially so-called outer cord. Venation usual for Limonia, with discal cell moderately long; M 3+4 and M 4 subequal in length. Halter with pale stem and slightly darker knob. Legs yellow, including coxae and trochanters, with femora darkened at tips, tibiae only slightly so, and distal tarsomeres dark brown; tarsomeres 1 slightly longer than rest of tarsi.

Abdomen obscure yellow dorsally, paler ventrally. Male terminalia (Figs 5–6) yellow. Tergite 9 essentially semicircular in outline. Its posterior margin broadly rounded, formed by chitinized bar with distinct U-shaped median notch between short lobes. Gonocoxite comparatively short. Gonostylus conical, rather short, evenly arched and tapered to narrowly rounded tip, slightly swollen in proximal half. Aedeagus of moderate length and breadth, bulbous in proximal third, then parallel-sided, narrowed before apex. Paramere moderately emarginated at posterior margin, with its inner process rather broad at base, narrowly rounded at tip.

Female unknown.

Differential diagnosis. According to SAVCHENKO (1985), the new species clearly belongs to the L. phragmitidis species group and resembles L. stigma (Meigen, 1818) in general appearance. Its body colouration is, however, still paler, antenna paler, with shorter verticils, and the prescutal stripe is less distinct. The three spots at the anterior wing margin, although small in extent, are more intensive and more sharply indicated. The aedeagus of the male terminalia is bulbous only in the proximal third and the inner process of the paramere is narrowly rounded at the tip, whereas, in L. stigma, the aedeagus is considerably broad in the proximal half and the inner process of the paramere is broadly rounded at the tip.

Etymology. This new species is named in honour of one of its collectors, Dr. Pjotr Oosterbroek (ZMAN), an outstanding specialist of Tipulidae and a world-famous compiler of the electronic Catalogue of the Craneflies of the World. A noun in genitive singular.