Dolerus puncticollis
A black bodied species. The female has red knees on the hind legs. Similar to D. gonager. In puncticollis the setae either side of the sawsheath are directed outwards in dorsal view to form an obtuse angle (acute in gonager). In puncticollis (both sexes) the side lobes of the mesonotum are copiously punctured on the lateral faces (shiny with few punctures in gonager).
Larvae feed on grasses.
Size: 8-9mm
Status: Widely distributed
Distribution: England, Scotland, Wales, Ireland
Flight period: May to June
Plant associations: Gramineae (grasses)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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References:
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Heidemaa, M. & Saarma, U. 2005: Phylogenetic relationships in Dolerus gibbosus species group and Dolerus varispinus complex (Hymenoptera: Tenthredinidae) as inferred from molecular and morphological data, with revisory notes on D. varispinus complex. Unpublished manuscript
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