A couple of weeks ago I was sitting at my dining table gazing out the window when I spotted this silhouette throught the blind:
So I snapped a picture and I really like the detail through the blind. It’s clearly a cricket, and a male (it lacks the long pointed ovipositor of the female which would be protruding from the back end) and its very long, very fine antennae are visible too.
So I popped around the other side of the blind to take a proper photograph, which unfortunately had to be through the window:
The markings on this creature suggest he’s a Roesels Bush Cricket
I went on to do some research on the Roesels bush cricket, Metrioptera roeseli, and it turns out it’s quite an interesting creature. It is a European species, named after the German artist and entomologist August Johann Rösel von Rosenhof, which found its way to England in the late 19th century where it established a toe hold in the far south east, in Kent and Sussex, where it remained for several decades. In the last few decades, possibly assisted by climate change, it has spread over much of south east England and the Midlands.
The migration of this species may have been assisted by the road network which could provide conduits for travelling further afield. There are two forms of this insect, the macropterous or long winged form, and a short winged form. It is reasonable to imagine that the long winged cricket would migrate further and faster, but even though Cambridgeshire appears to be towards the northern periphery of their range this short winged individual has arrived here too.
Roesels bush cricket is distinguished from all other bush crickets by the yellow/green edge to the hard cover of the thorax – the ‘pronotum‘ – and the light spots immediately behind the pronotum. One other similar species, the bog bush cricket, also has a light edge to its pronotum but it doesn’t extend all the way round as it does with Roesels bush cricket.
I’d never heard of Roesels bush cricket before I started trying to identify this individual, and then a few days later I was rooting around in the undergrowth of a field of scrub, also here in Histon, and I spotted a creature which I thought was a very green grasshopper. I managed to fire off a couple of photographs and when I uploaded the images it turned out to be a cricket not a grasshopper:
The macropterous form of Roesels bush cricket
And it was another male Roesels bush cricket but he clearly has the long wings of the macropterous form which extend well beyond his abdomen. So it appears I’ve found both forms of this colourful creature within a week. It’s amazing what can be found by poking around in the long grass!