September 2019

Green Shieldbug nymph

It’s been a busy month in the insect world as you would expect at this time of year and we’ve seen many new species – new as in insects we haven’t seen or noticed before.  The hemiptera have been well represented – this group of insects, as the name suggests have half the wing membranous and the other half hard like a beetle.  Shield bugs are typical hemiptera.  We have seen Hairy Shield-bug, Green shieldbug and a Black-kneed capsid bug.

There have also been a couple of tiny ones that only have latin names so I won’t bore you with those.  I found one hemipteran bug called an Ant Damsel bug which looks like an ant but isn't one that I didn’t know existed until I looked on a Facebook Group to identify the others.

The pond has attracted 5 species of dragonfly, and one or two emperor dragonfly females have been laying lots of eggs in the pond, so that bodes well for future years.  The moth trap has given us at least 3 species that we’ve not seen before as well as a mayfly, an hemipteran bug and two new beetles.

Ant Damsel Bug nymph

Mayfly - Cloeon dipterum

Hairy Shield-bug nymph

The most interesting beetle was called a Hornet Rove Beetle.  Rove beetles are the sort of radical wing of the beetle party and choose not to look like beetles at all.  They don’t bother with wing cases to cover the whole of their abdomen and could easily be mistaken for an earwig.  The wing cases are very short (typically less than a third of the length of the abdomen) so that the wings have to be folded up to fit into the small space.  These obviously take longer to deploy than normal rigid wings which perhaps explains why rove beetles tend to run rather than take flight.  Probably the best known type of rove beetle is called the Devil’s Coach Horse. 

Devil's Coach Horse (Staphylinus olens) in threat pose

This is a fearsome looking insect with powerful mandibles and will raise its tail in a threatening scorpion-like manner should you approach it.  If you ignore the threat it will give you a painful bite and probably emit a foul odour from the white scent glands on its tail.

The Hornet Rove Beetle is a similar looking insect – in fact, I thought it was a devil’s coach horse at first.  It is however much broader and stockier than the devil’s coach horse and used to be very rare, but as hornets are extending their range, so are the hornet rove beetles.  This is because the hornet rove beetle spends most of its time in hornet nests where they feed on the detritus inside the nest and are presumably tolerated by the hornets for providing this clean-up service.  It is a strong flier with a keen sense of smell (which enables it to find hornet’s nests in the first place) and when it runs out of food in the hornet’s nest it can fly considerable distances in search of other insects and invertebrates.  It does this extra-mural foraging at night which explains how it ended up in the moth trap.

And for those who think I don’t get out enough – I found a very interesting fly in Philippa’s garden.  Whatever the bush is called that it was found on, it must be a very good nectar source because it had attracted a large number of flies.  This particular fly is one of the picture-winged flies that often have interesting markings on their wings – in this case the wings were rather plain but it did have rather striking stripy red eyes.  It goes by the catchy name of Physiphora alceae.

Hornet Rove Beetle -  Velleius dilatatus

Picture-winged fly - Physiphora alceae

Black-kneed Apple Capsid - Blepharidopterus angulatus

Miridius quadrivirgatus

Stenodema (Stenodema) laevigata

August 2019

Meadows are becoming very popular, if not to say fashionable at the moment.  A recent Gardener’s World special program was all about meadows.  They highlighted the 97% decline in wildflower meadows since 1945 due to changes in farming practices to feed the baby-boom generation.  The decline in wildflower meadows is associated with an equally dramatic, though slightly delayed decline in insect species.  The programme went on to suggest ways of incorporating wildflowers into your garden as well as planting cultivated flower meadows.  Another highlight was the concept of ‘Coronation Meadows’.  This was introduced by the Prince of Wales to try and slow the decline in pollinating insects.  It is a concept worth exploring as there is a coronation meadow in each county that can provide seeds for recipient meadows in the same county.  Our local coronation meadow is Coach Road Field in Battle.

We have had our own wildflower meadow for several years now (if you can call 20 or so square metres a meadow) which changes not only through the seasons, but also year by year.  It was created by simply letting the grass grow.  Species like bird’s-foot trefoil, red clover, common vetch and self-heal appeared almost immediately, but others like ox-eye daisy and wild carrot have taken longer to get established.  We have tried adding various species to improve the variety but only ox-eye daisy and snake’s-head fritillaries have taken with any degree of success.  Gradually, however, the areas that have no flowers are shrinking as the grass is pushed back.

Wild Carrot - Daucus carota

At the moment wild carrot and ox-eye daisies are dominant – wild carrot being perhaps the most attractive species with its lacy white heads.  It is the heads that gave it the name Queen Anne’s Lace when it was introduced to the USA  (Though there is some uncertainty about which Queen Anne is so honoured – Denmark also had one).  The red spot in the centre of the head supposedly represents a drop of blood from when Queen Anne pricked her finger lace-making.  The wild carrot exemplifies the purpose of the meadow in attracting lots of insects.  We get lots of pollen beetles (tiny black beetles that can be found on almost any flower), iridescent green ‘thick-kneed’ beetles, and soldier beetles (probably Cantharis species, otherwise known as bonking beetles!)  I have also seen solitary wasps, weevils, butterflies and many different flies.  Because the individual florets are small, the nectar is more easily accessible and doesn’t need the specialized tongues of bees and butterflies so those species tend to go to other flowers where there is more nectar but it is only available if you have the right equipment. 

Sharp-tailed Beetle, so far unidentified

Among the more interesting finds on the wild carrot were a number of sharp-tailed beetles that have so far resisted attempts at identification and the photos have by now hopefully reached the Natural History Museum.  They could be rare – watch this space.  Another find was Misumena vatia – please excuse the scientific name, as far as I know it doesn’t have a common name.  This is an ambush spider that is almost pure white, though it can be pale pink or pale green depending on the colour of the flowers that it sits on. 

Female Misumena vatia with prey and mate

As the word ‘ambush’ suggests it sits on flowers blending into the background waiting for pollinating insects to come along which it then jumps on – no web required.  The spider that I saw was a large female that had just sunk its fangs into a large blow-fly.  On top of the spider’s abdomen was another spider, a male Misumena vatia that was clearly using the fact that the female had her mouth full for a safe mating opportunity – a completely new meaning for ‘safe sex’!

The wild carrot plant – Daucus carota – has leaves and roots that smell faintly of carrots, and the young roots are edible and taste of carrot.  This is not so surprising because one of the cultivars of wild carrot – the subspecies D. carota sativus - is the carrot you can get in any supermarket and which also attracts insects – especially the carrot root fly.

Daucus carota sativus - the humble carrot, variety unknown - from the Coop.