Feeding on pansies in garden
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I think this is B. humilis, not pascuorum. There is no sign of black hair on the gaster, and an obvious brown 'belt'.
Mydaea, can I pick your brains please, what rules out B. muscorum ? I agree with you that it's not B. pascuorum.
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The most obvious feature in this picture is the contrasting brown band on T1. B. muscorum never has that - very pale all over the gaster. I don't have much doubt it is humilis.
Really the only way to separate them with any confidence is by microscopic scrutiny. The abdominal band character is not reliable (nor is the lack of black hairs on the abdomen (in northern Scotland) nor even the presence/absence of black hairs above the tegulae.
Than being said.... in Dorset.... B. humilis is much more likely than B. muscorum and is well known from much of the coastal strip from Weymouth and eastwards across to Purbeck
I agree with all of that, but in my extensive experience of muscorum I have never seen one with even a faint brown belt, let alone one as obvious as this one.
Lat/Lng: 50.650205, -2.432451
OS grid ref: SY695834