The head is black and the abdomen broadly yellow above. The stigma is yellow and the legs are mostly yellow but with black bases to the femora.
In the male, the thorax is black marked paler on the tegulae, hind margin of pronotum and on the mesonotum. In the female, the thorax is mostly red above and the yellow of the abdomen more or less spotted piceous on the tergites.
Periclista albida larvae feed on sessile and English oak. This species has the shortest branched bristles of the British species with the branches much longer than the stems. The anal abdominal segment has 2 branched bristles in the middle with 3 simple bristles on either side. The head is also paler.
Size: 5 - 7mm
Distribution: England, Scotland, Wales, Ireland
Flight period: April to May
Plant associations: Quercus petraea and Quercus robur (sessile and English oak)
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).