A 'spotless' Harlequin. It has the brown legs and white markings on the head. About 6mm long.
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The colouring is right for 10 spot, as you say. Now the silly question - why no spots?
actually has two large spots, one each at the outside front corner of each wing case, these are lighter that the wing case colour. This is just what you'd expect for a teneral (i.e. just emerged and yet to fully colour up) example of f. bimaculata which has black wing cases with two large red spots.
for a fully coloured up specimen of the same colour form, see: http://www.ispot.org.uk/node/262771?nav=related
OK and thank you.
Lat/Lng: 50.72044, -1.84664
OS grid ref: SZ109912