Aprionus sifae sp. nov. urn:lsid:zoobank.org:act: 1F9333D3-0C73-49B6-AFC7-803A29D74286 Fig. 5 Diagnosis Aprionus sifae sp. nov. is tentatively classified in the insignis subgroup because of the outline of its subanal plate, the tegmen with slightly indicated twin-cavity structure, and the gonostyli resembling that of A. friggae sp. nov. An obvious distinction to other species of the halteratus group is that the tegminal fingers, present in 3–4 (rarely 2 or 5) pairs, are very small and point dorsally rather than laterally (↓, Fig. 5A). Etymology Sif, distinguished for her golden hair, is the wife of Thor. Material examined Holotype SWEDEN: ♂, Öland, Mörbylånga, Ullevi, 56.37° N, 16.36° E, herb-rich meadow near broadleaf forest, Malaise trap, M. and C. Jaschhof leg., 14 Jun.–15 Jul. 2015 (NHRS, no. CEC290). Paratypes SWEDEN: 1 ♂, same data as for the holotype (NHRS, no. CEC 291); 2 ♂♂, same data, but 24 May–13 Jun. 2015 (NHRS, nos CEC 292–293). Other material studied SWEDEN: 2 ♂♂, Öland, Mörbylånga, Ottenby Bird Observatory, coastal meadow, MT, MCJ leg., 16 Jun.–8 Jul. 2015 (DEI, nos CEC 294– CEC 295). Other characters Body size 1.3–1.4 mm. HEAD. Eye bridge 4 ommatidia long dorsally. A dense row of 9–10 postocular bristles. Neck of fourth flagellomere slightly longer than node; 3–4 thick translucent sensilla, usually simply hair-shaped, rarely two- to three-pointed (Fig. 5B). Palpus with 3 segments, apical segment slender, almost as long as first and second segments together. WING. ApicR 1 3.0–4.0 times as long as Rs. LEGS. Claws subrectangular, 2–3 fine teeth. Empodia rudimentary. TERMINALIA (Fig. 5A). Ninth tergite subrectangular, anterior margin fully sclerotized, concave medially. Gonocoxites rounded to slightly pointed ventroposteriorly, depending on preparation; projections of medial bridges absent to slightly indicated; dorsal bridge small, typically subtriangular. Gonostylus thick and convex on basal half, elongate and tapered on apical half, apical tooth indistinct, 2 (rarely up to 4) bristles subapicomedially. Tegmen rounded apically. Subanal plate subrectangular, with darkly marked shoulders posteriorly, indistinct variable dark markings elsewhere. Distribution and phenology Sweden (Öland). Adults were collected from May to July in various types of meadow.

Published as part of Jaschhof, Mathias & Jaschhof, Catrin, 2017, New species of Aprionus (Diptera, Cecidomyiidae, Micromyinae) from Sweden and other parts of the Palearctic region, pp. 1-38 in European Journal of Taxonomy 378 on pages 10-12, DOI: 10.5852/ejt.2017.378, http://zenodo.org/record/3838627