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the female Common Hawker's antehumerals look disturbingly like a Migrant but the yellow costas are a great indicator.
I know Jccurd,
Is the antehumeral the part with the golf tee thing?
This is the 2nd one that Ive seen recently, the first one did a great job of making me think I had Migrant until I got home and started looking at pics in a book-
No, not the golf tee thing.
The antehumeral stripes are on the top-front of the thorax, a pair of lines right behind the eyes, one either side of the centre line. In the Migrant (both sexes) and the female Common Hawker, they are quite short lines but on the male Common are much longer, almost reaching the wing roots.
On the Southern Hawker, they quite wide, looking more like patches than stripes. Flying at you, it looks as though a Southern has its headlights on. :)
Yes I had noticed that also. Thanks for pointing out what the antehumeral is. I get 'ante' but what does 'humeral' refer to? Is it thorax related?
That was another thing that looked Migrant-like, ie the unmarked upper surface in that department. I just wondered of this was due to wearing?
Thanks for comments.
The exoskeleton of an insect is made up of what I can only describe as plates. Where those plates join is known as a suture - the most obvious sutures lie between the various segments (10 of 'em) of the abdomen.
On the thorax, just forward of the wing roots, is a suture, angled down towards the legs, called the humeral suture. (I don't know why it has that name, but it does.) Sometimes there is a line along that suture and that's called the humeral stripe.
The antehumeral stripes lie before, i.e. forward of or slightly above, the humeral suture.
I think that's right, albeit a little difficult to picture without a diagram.
Thanks John, thats perfect, forward of the humeral suture.
Lat/Lng: 55.0112, -6.012
OS grid ref: NW435758