Tenthredo mandibularis FABRICIUS, 1804

Liston, A. D., Knight, G. T., Heibo, E., Bland, K. P., Barstad, Trond Elling, Blank, S. M., Boeve, J. - L., Fiedler, K., Grearson, K. J., Halstead, A., Jacobs, H. - J., Jansen, E., Lonnve, O., Prous, M., Robinson, J. & Taeger, A., 2012, On Scottish sawflies, with results of the 14 International Sawfly Workshop, in the southern Highlands, 2010 (Hymenoptera, Symphyta), Beiträge Zur Entomologie = Contributions to Entomology 62, pp. 1-68 : 54-55

Tenthredo mandibularis FABRICIUS, 1804

Edinburgh; Roseburn : 3 ♂♂, 16.vi.2010, leg. Liston ; 1 ♀, 17.vi.2010, leg. Liston. Midlothian, Gorebridge, Gore Glen , 1 ♂, 18.vi.2010 . Edinburgh, Juniper Green, W. of Leith , 1 ♀, 19.vi.2010, leg. Liston. Angus, 3 miles North of Kirriemuir , 2 ♂♂ (many more individuals seen, but only these two taken as vouchers), 23.vi.2010, leg. Liston ( SDEI, RSME) .

These Scottish adults were collected exclusively from stands of Petasites hybridus , which seems likely to be the larval host. According to Benson (1952) Tenthredo mandibularis is “Recorded from Dorset, Hants., Essex, Kent, Beds., Oxon., Yorks., and Cheshire. Probably occurs wherever the Petasites is abundant in England.” No previous records from Scotland of this conspicuous and distinctive species are known. Published hostplant records refer only to Petasites , usually without naming a species ( Lorenz & Kraus 1957), or identify only P. albus as a host ( Pschorn-Walcher & Altenhofer 2000). According to observations apparently made only by Brischke (1883), but often repeated in subsequent publications without citation of the source, Petasites officinalis (a synonym of P. hybridus ) and Tussilago farfara are hosts. Tussilago farfara is the main or only host of T. mandibularis in Norway according to Heibo & Lönnve (2005).