Ghostly goings on in the Quarry? Well actually no. These webs are created by Tetranycus lintearius the Gorse Spider Mite. The adults are half a millimetre long and bright red. A native to Europe, it has been introduced to other countries as a biological control measure, although it does not actually kill gorse it can reduce flowering and stunt the development of branches. The mites pierce the tissues of the plant whilst feeding.
Hunting through parched grass in the quarry in the hope of finding interesting insects, a wasp of a new family was found. The family is Bethylidae, and the wasp is Epyris niger. It was entirely black, approximately 4mm long, and had a prognathous head. Microscope examination proved it to be a most interesting insect that is evidently quite a serious predator. It has a powerful sting to disable larvae of lepidoptera and coleoptera which are then dragged away – eggs are laid on the prey. This is another new species to add to the ever-growing list for the Country Park.
I must apologise to anyone who has tried to download the full Country Park leaflet recently. I was not aware that the link was broken. All restored now (until the next time!) and the updated map is now on the map page.
No this is nothing to do with internet malware! It is a reference to the Shakespeare play Troilus and Cressida. Today’s new record for the Country Park (and for me) is Troilus luridus aka Bronze Shieldbug. This is a predatory shieldbug which preys on a variety of other insects. My find is a final instar nymph which is possibly the most striking phase of it’s life cycle. The contrast between the green, white and metallic bronze is an amazing sight!
A couple of interesting photos today, the first is also a first for me as it is a teneral adult Birch Shieldbug. The teneral stage occurs when the final instar nymph moults into an adult and the exoskeleton has not yet hardened and it is very pale in colour. The first picture is the teneral and the second is a mature adult for comparison.
The third photo is of a pair of Parent Bugs mating to produce what I understand to be a second brood at this time of year. I am told that the female mates with a different male to the one of the first brood.