Sunning itself on a plastic garden chair, a popular basking spot with flying insects.
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The most recent key to Sitona is in the Royal Entomological Society's handbook series. It is by Mike Morris and published in 1997. Royal Ent Soc keys are now available from the Field Studies Council:
There are 20 British species of Sitona and I must admit I find them a tricky genus to deal with. However, the vast majority of the ones I encounter in my garden seem to be Sitona lineatus, and yours could well be this. Unfortunately, S. lineatus comes out right at the end of the key!
Entomologist and biological recorder
As Martin says, Morris (1997) is the best and most recent key - Sitona can indeed be fiddly and really needs a specimen - I had a go at keying it out as surface features are primarily used but ground to a halt about two-thirds of the way through,
Thanks for the information Martin, and for having a go at keying it Dave. You've convinced me that I should be satisfied with Sitona sp!
Lat/Lng: 52.6, -1.2
OS grid ref: SK5501