Help is needed to record False Blister Beetles (Oedemera) in Scotland.
There are two species of Oedemera that occur in Scotland and another two that might be found there. The relative distributions of the two Scottish species are not well known and more records are needed in order to clarify the situation.
The general shape of all four Oedemera species is very similar. They are all slim with tapering elytra that have longitudinal ridges and could at first glance be mistaken for longhorn beetles. While the two species are very similar the males are easy to identify with a hand lens and then the thickness of the hind femrora (thighs) will separate the two species. A photo showing the hind legs would be very useful.
The information sheet and descriptions below give much more detail.
Please email your sightings to Bruce Philp along with:
- Date of sighting
- Location name (on OS map)
- Grid reference
- Photograph of specimen
Records will be passed to the UK Beetle recording scheme.
Records currently held on the NBN Atlas for the UK can be found by searching Oedemera.
Please abide by current restrictions and social distancing rules while out looking for beetles.
Information on Oedemera
7-9mm. A slim, dull ‘sage green’ beetle that can be abundant and is usually found in flowers, often buttercups. The males (see photo) have slightly swollen femora while the femora of the females are slim.
This appears to be the more widely distributed species with a lot of records from south west Scotland. Until relatively recently it was a Red Data Book species more or less restricted to the north east of England, but it appears to have expanded its range although it is still classed as Nationally Rare. From a few records in Ayrshire in the early 21st century it now seems to have spread north. There is a 2018 record from Skye that could be this species.
6-8mm. Very similar in appearance to O. virescens and has similar habits. While on average it is slightly smaller this is not a good distinguishing characteristic. Both sexes have slim femora so the two species are easily confused, especially as they share similar pollen feeding habits. A guide to separating the two species is given on the identification sheet.
Although common in England there are very few Scottish records. However, it is possible that it is more widespread than currently realised and more records are needed.
The focus of this request is very much on O. virescens and O. lurida. Any records should, where possible, be accompanied by either a specimen or a good photo (especially showing the hind legs) plus date, grid reference and location.
These are the two possibly Scottish species. Any records would be welcome, again accompanied by full details, photos etc.
Oedemera nobilis (The Swollen-thighed beetle)
8-11mm. O. nobilis is larger and is a much brighter green with slimmer elytra that are separate at the apex. It is common and widespread in England, but has apparently not been recorded in Scotland. The males have grossly swollen femora and while the females’ femora are slim their colour and larger size should distinguish them. Another pollen feeder, it is likely that if it is found in Scotland it is restricted to the very south.
13-20mm. This is the largest member of the genus and is brown rather than green. It is also nocturnal and is found on trees such as willow. It has been recorded in Scotland, but it seems likely that any new records will be in the very south.