Abstract
Drapetis is a genus of tiny predaceous hybotid flies found frequently on the bark of trees. From a single locality in province Skåne (S Sweden) we report the co-existence of seven species of Drapetis. One is new and described as D. abrollensis sp. nov., and four species, D. assimilis (Fallén), D. completa Kovalev, D. infitialis Collin and D. stackelbergi Kovalev, are relatively recent additions to the list of Swedish Diptera. A key to males of the 14 species of Drapetis known from NW Europe is given. Special emphasis is given to modifications of the midleg cuticle observed in males of several species that belong to the D. exilis-species group. As shown by SEM images these modifications differ greatly between the species, both at light microscopic and ultrastructural levels. These modifications are introduced as a new set of characters in the identification key. Finally, brochosomes were detected on the midleg of three SEM-examined Drapetis species, documenting indirectly that small leafhoppers are regularly used as prey.
References
Chvála, M. (1975) The Tachydromiinae (Dipt. Empididae) of Fennoscandia and Denmark. Fauna entomologica scandinavica, 3, 1‒336.
http://dx.doi.org/10.1163/187631272X00012
Chvála, M. & Kovalev, V.G. (1989) Family Hybotidae. In: Soós, Á. & Papp, L., (Eds.), Catalogue of Palaearctic Diptera. Vol. 6. Therevidae—Empididae. Akadémiai Kiadó, Budapest, pp. 174‒227.
Collin, J.E. (1961) Empididae. In: British Flies. Vol. 6. Cambridge University Press, Cambridge, pp. i–viii + 1–782.
Cumming, J.M. & Wood, D.M. (2017) [Chapter] 3. Adult morphology and terminology. In: Kirk-Spriggs, A.H. & Sinclair, B.J. (Eds.), Manual of Afrotropical Diptera. Vol. 1. Introductory chapters and keys to Diptera families. Suricata 4. South African National Biodiversity Institute, Pretoria, pp. 89–133.
Grootaert, P. (2016) Drapetis bruscellensis (Diptera, Hybotidae) a new species for science from the outskirts of Brussels, a not so cryptic species supported by COI barcoding. Belgian Journal of Entomology, 41, 1‒14.
Grootaert, P., Shamshev, I. & Stark, A. (2010) Drapetis flavipes Macquart (Diptera, Hybotidae) new for the Belgian fauna, with a re-description of the species and a preliminary key to the West-European species of Drapetis. Bulletin de la Société Royale Belge d’Entomologie, 146, 110‒115.
Hellqvist, S. (2013) Nytt i den svenska fluglistan från norra Sverige [New species in the Brachycera list from Northern Sweden]. Entomologisk Tidskrift, 134, 111‒119.
Jonassen, T. (1998) Recent additions to the Norwegian fauna of Empidoidea (Diptera, Brachycera). Fauna norvegica, Series B, 45, 63‒68.
Jonassen, T. (2009) Notes on some Empidoidea (Diptera, Brachycera) new to the Norwegian fauna. Norwegion Journal of Entomology, 56, 20‒23.
Kahanpää, J. (2014) Checklist of the Empidoidea of Finland (Insecta, Diptera). ZooKeys, 441, 183‒207.
https://doi.org/10.3897/zookeys.441.7154
Kovalev, V.G. (1972) Diptera of the genera Drapetis Mg. and Crossopalpus Bigot (Diptera, Empididae) from the European part of the USSR. Entomologischeskoe Obozrenie, 51, 173–196. [in Russian]
Kozánek, M. & Belcari, A. (1997) Structure of the ovipositor, associated sensilla and spermathecal system of entomoparasitic pipunculid flies (Diptera, Pipunculidae). Journal of Natural History, 31, 1273‒1288.
http://dx.doi.org/10.1080/00222939700770701
Raffone, G. (2013) Description of three new species of Drapetis Meigen, 1822 from Tuscany (Italy), with key to species from western Europe. Bollettino del Museo Civico di Storia Naturale di Venezia, 64, 45‒50.
Rakitov, R. & Gorb, S.N (2013) Brochosomes protect leafhoppers (Insecta, Hemipteera, Cicadellidae) from sticky exudates. Journal of the Royal Society Interface, 10 (87), 1‒7.
https://doi.org/10.1098/rsif.2013.0445
Sinclair, B.J. & Cumming, J.M. (2017) Hybotidae. In: Kirk-Spriggs, A.H. & Sinclair, B.J. (Eds.), Manual of Afrotropical Diptera. Vol. 2. Nematocerous Diptera and lower Brachycera. Suricata 5. South African National Biodiversity Institute, Pretoria, pp. 1237–1249.
Suludere, Z., Lavigne, R. & Acikgoz, F.B. (2018) First record of accidental contamination of Asilidae (Insecta: Diptera) with brochosomes. Entomological News, 127, 413‒416.