I hadn’t realized there were two (hinged) parts to the snout and am wondering what function that serves.
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a blueish hue to the thorax as well. What a nice bright fly Grant
- though I didn't think anything actually 'fed' on cow parsley. Must have mistaken it for early hogweed..
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I didn’t see it feeding. Could it have been displaying? – big active snout, so genetically fit??
isn't the snout for accessing deep flowers? You're suggesting it's used in display as well? Seems reasonable. (If I had one like that and couldn't conceal it then I'd certainly want to make the most of it..)
If this is signalling genuinely linked to genetic fitness, and only one of the sexes does it, then you might expect the snout to be larger in that sex as the result of sexual selection. Records of Rhingia may already be able to indicate if there is consistently any such difference in size.
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707