Autumn is now here and most hymenoptera are gone, my last walk I saw very few bees at all, Hornets and wasps were plentiful as their colonies are now at full strength. Loads of ladybirds around especially if you use a sweep net.
A scarce yellow-marked Crossocerus, closely resembling the relatively frequent C. dimidiatus, but typically with entirely yellow tibiae.
Recorded widely, though sparingly, across England, with one record from Scotland (Murroch Glen, Dunbartonshire, 1903). Abroad, known from central Europe and the Caucasus (Lomholdt, 1975-76).
Status (in Britain only)
Listed as Notable B by Falk (1991) (now known as Scarce (Nb)). There is no evidence of a particularly strong decline, though it has never been a common insect.
Associated with dead wood and timber, with British records from a variety of situations, including woodland, parkland, wetland, non-intensive agricultural settings and even gardens.
Univoltine; early June to early September.
Medium-sized flies such as lauxaniids and rhagionids.
Nesting occurs in burrows in dead wood and timber, including fallen logs, rotten stumps, fence posts and building timbers.
No information available. Males may ‘swarm’ around trees and bushes in a similar manner to C. dimidiatus.
The only confirmed record on iRecord and NBN and only one other record which is unconfirmed.
Widespread but local throughout England and Wales to Glamorgan and north to Inverness-shire. There is also one record from Ireland.
The species is common across Europe (Lomholdt 1984)
Status (in Britain only)
Not listed in Shirt (1987) or by Falk (1991) and is not thought to be scarce or threatened.
Else & Felton (1994) indicate a varied habitat selection, including open woodland, heathland and coastal locations. Associated with dead wood habitats for nest sites.
Richards (1980) cites May to September.
Nymphs of homopteran bugs within the families Delphacidae and Cicadellidae (Richards 1980). Lomholdt (1984) notes that up to 38 prey specimens have been provided for one larva.
Widely quoted as nesting in old beetle holes in dead wood and this is undoubtedly typical, but John Felton (Else & Felton 1994) has observed a specimen leaving a burrow in the soil.
Not my photo,
Specimen retained for county records.
I found a lovely patch of yellow loosestrife and with it Macropis europaea which specializes on Yellow loosestrife.
For more information please see a past post here
Wasps are hunting their prey from flies to the smaller lasioglossum bees to caterpillars. Until this year I had never seen a Nysson sp of wasp in the last two months I’ve seen two species one rare and loads of Nysson trimaculatus.
This is the third or fourth year I have recorded this bee at this location and according to NBN and iRecord my records are the only records for Cambridgeshire.
If you would like to find out more about this bee then please see my past post here