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From woodland ride, 10mm long
No pd seta on hind tibia and despite a hard look with the microscope I can't see any setulae on the radial node.
Santy eye hairs, short hairs on arista.
3 setae on katepisternum, 2 presutural ac and 4 postsutural dc.
I'd be grateful for some guidance as to which family to look at. I can post more photos if they would help.
Thanks, Peter

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lateral

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Helina impuncta.

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That's great Stephane.
I'm gradually collecting photos of different genera. My problem at the moment is getting to a genus - what is is that makes you say just from a photo that it belongs to the Helina genus ?

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Muscidae with stout habitus (Phaoniinae-Mydaeinae) : no pd on distal part of hind tibia, so not Phaonia. Then, heavily dusted body suggests Helina (when abdomen has paired spots it is even more easy). And Mydaea haven't presut. acr.

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Thanks for all your help Stephane.
So to an extent it's by elimination plus experience. Are these dark marks on T3 & 4 the spots you are referring to ?

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These are, but it raises an unusual case, because Helina impuncta has only rarely a spotted abdomen. Anyway it is H. impuncta.