Acoenonia nana Meyer & Spungis Fig. 10A–D Two males studied here from Sweden apparently belong to Acoenonia nana, although they differ slightly from the descriptions of this species in the literature, which were based on specimens from northwestern Germany (Meyer & Spungis 1994; Jaschhof 1998). The peculiarities found in the Swedish specimens are as follows: the gonostyli appear to be somewhat narrower (Fig. 10A–B); the ventral emargination of the gonocoxites is slightly angled laterally (Fig. 10A), not evenly V-shaped; the tegmen is somewhat broader (Fig. 10A); and the base of the ejaculatory apodeme is only slightly enlarged (Fig. 10A), not strongly extended and compressed. In the latter two characters both specimens are not uniform (see Fig. 10A versus 10C). This is the first report of A. nana occurring in Sweden and Fennoscandia. Material studied. New to Sweden: 1 male (CEC374), Uppland, Älvkarleby, Båtfors, mixed pine / broadleaf forest at lakeside, 20 April–14 June 2004, MT, SMTP (trap 7, collecting event 387) (in NHRS); 1 male (CEC375), same locality but 17 July–16 Aug. 2005 (collecting event 1593) (in SDEI).

Published as part of Jaschhof, Mathias, 2017, Catochini, Strobliellini and Acoenoniini revisited: a taxonomic review of the small tribes of the Micromyinae (Diptera: Cecidomyiidae), pp. 275-295 in Zootaxa 4250 (3) on page 292, DOI: 10.11646/zootaxa.4250.3.5, http://zenodo.org/record/495060