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Photo#410046
Fontana Grasshopper - Trimerotropis fontana - female

Fontana Grasshopper - Trimerotropis fontana - Female
Santa Barbara County, California, USA
June 11, 2010
Size: ~3cm
Found in recently burned Burton Mesa chaparral habitat (formerly dominated by dense, large Arctostaphylos spp. now relatively barren). Crepitations from males in area was an interupted buzz, short direct flight, easy to approach.

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Moved
Moved from Trimerotropis.

Two of the species on your list
are going to be difficult without seeing wings. T. thalissica (which I think usually has the longer more slender wings), should have bluish wings, and T. fontana should have yellow wings (though often with a strong tinge of greenish). I think the dark cross band is consistently present on the hind wings of T. fontana, but often faint or narrower on T. thalassica. I don't know if they sound any different in flight. T. fontana makes a buzz that is usually irregularly interrupted. I've not heard T. thalassica, but it is supposed to "buzz".

This one "looks" like T. fontana to me.

 
I'm pretty sure you're right
From what I can tell, you're right on the T. fontana. I grabbed some for wing etc. shots today that I'll post.

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