The head and the abdomen are generally dark as is the stigma. The thorax is dulled by very fine, shallow punctures. The antennae are longer than P. lineolata and segment 3 is equal to or shorter than segments 7 and 8 combined.
In the male, the tergites have pale apical margins. The legs have black femora, white tibiae (apically brown) and brown tarsi. In the female, the abdomen is laterally marked with reddish-yellow on the downturned face of each tergite and the femora and tibiae are mainly reddish-yellow.
Larvae feed on sessile and English oak. Eggs are deposited into the unfirling leaf buds. This species has the longest branched bristles of the British species, with the bristles dorsally having the branches clearly shorter than the long stems.
Size: 6 - 7mm
Distribution: England, Scotland, Wales
Flight period: April to May
Plant associations: Quercus petraea and Quercus robur (sessile and English oak)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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
Lorenz, H. and Kraus, M., 1957. Die Larvalsystematik der Blattwespen (Tenthredinoidea und Megalodontoidea) aus dem Zoologischen Inst. Univ. Erlangen. Abh. Larvalsyst. Ins, (1).