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What excludes E. punctata?
I agree that it can't be ruled out for sure; though, looking at specimens of punctata, the frons and occiput of that species are much duller compared to trigramma, so I suspect that trigramma is correct.
My Flickr photos...
Good Question. The short answer is a good key, a decent hand lens and lots of images
First antennal joint elongate, much longer than second joint. Thorax conspicuously striped or darkened on the disc 3. Thorax with three stripes. No supra-alar bristle. Thorax with grey [not reddish yellow] interstices between the darker stripes
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Mydaea is right. I was forgetting about punctata. It could well be that species...impossible to be sure from these pictures. Better to give a split ID, perhaps (unless you took the specimen and checked?).
Yes its a good point I made some notes in the field but did not take the specimen I may revisit and do some images to compare and contrast punctata v trigramma as per Mydaea suggestion with microscope
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