Nematus umbratus
This species is similar to leucotrochus, but differs in the following features. The costa in the fore wing is pale at least in the basal two-thirds and the antennae are always completely black. On the mesonotum, the edges are often yellow and the abdomen is mostly all yellow. In the male, the upper side of the abdomen is yellow with a black stripe (completely black in leucotrochus, except for the ninth tergite).
Larvae feed on birches, elms, hazel and alders.
Size: Female: 5.5 - 7.5mm, male: <6.5mm.
Status: Rare
Distribution: England, Scotland, Ireland
Flight period: May to June, July to September
Plant associations: Betula spp., Ulmus spp., Corylus spp. and Alnus spp. (birches, elms, hazel and alders)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
-
- We are currently looking for images of this species. Please contact the webmaster if you can assist.
References:
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168
Muche, W.H., 1974. Die Nematinengattungen Pristiphora Latreille, Pachynematus Konow und Nematus Panzer (Hym., Temthredinidae). Deutsche Entomologische Zeitschrift, 21(1/3), pp.1-137.
Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63-127