Ametastegia carpini - Geranium Mandrel

Recorded widely across much of mainland Britain north to central Scotland. Can be common in garden settings on cultivated geraniums (Musgrove, 2023).

Ametastegia carpini has an entirely black thorax, abdomen and mostly dark hind legs though the hind trochanter is always pale apically. The scutellum is shining and impunctate in the middle. In the female the tegulae are usually white. In the male, the tegulae vary from yellowish-brown to black.

Larvae are free living and feed on hardy geraniums and crane's-bills.

Jump to other Ametastegia species

Size: 6 - 8mm

GB IUCN Status: Least Concern
GB Rarity Status: None

Distribution: England, Scotland, Wales, Ireland

Flight period: bi- or multivoltine, May to June, July to August

Plant associations: Geranium spp. incl. robertianum, pratense, sanguineum, sylvaticum (crane's-bills)


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.

Musgrove, A.J. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England, unpublished