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Photo#246885
Unknown 3 - Trimerotropis albescens - male

Unknown 3 - Trimerotropis albescens - Male
Nine Mile Canyon Road, Tulare County line, Inyo County, California, USA
August 19, 1961
Size: 2cm
Hoping to put names to a few old Californian specimens that are floating around the museum that I volunteer at.
One side of this specimen is damaged and shows a light yellow wing with a light crossband.

that's odd
I posted a comment on this one too. But, it's not here. Anyway, no it's not Cibolacris, it is a Trimerotropis. I believe it is probably T. albescens, but am not certain. It might also be T. inconspicua. Do you have a photo of it taken from above? The pronotum of T. albescens flares out at the rear lower angle on both sides, but not so on T. inconspicua (see photos of T. whitei, which is flared similarly to, but more than in T. albescens).

T. bifasciata looks similar, but I think it is too far east for that species (?), and that one is usually proportionately a bit shorter, stockier, with a bigger head and lower crest on the pronotum.

If you look closely at the shape of the pronotum in particular, you can see that it is quite different from Cibolacris. Also (if you have a hand lense handy), there is a row of teeth (a stridulatory apparatus) on the inside of the hind femur of Cibolacris (at least on the males), and there is one on the intercalary vein (a lengthwise vein roughly in the middle of the basal half of the tegmina) instead on Trimerotropis. That different sound making apparatus is why (at least at the moment) the two genera are put in different subfamilies, even though Cibolacris "looks" more like a Bandwing Hopper.

 
albescens
I checked this specimen today for the features you describe. The sides of the pronotum (viewed from above) are strongly divergent at the rear. I checked out Otte's book, and everything seemed to check out well as Trimerotropis albescens. Your help is much appreciated. I'll frass all these poor specimen shots.

 
Frass or not to frass
With this species, there are no others on BugGuide; so, based on that alone, I'd say go ahead and move it to the correct species, at least until something better comes along (I wouldn't call this one "poor" anyway - just not so nice as seeing a live one with that bit of personality still in it's eyes :)

I think most of the others are of value for similar reasons. There are only few photos of Opeia obscura and Mestobregma impexum, and none from California for those species.

By the way, you're welcome. The riddles are always fun to try and solve, and I always enjoy seeing the photos, especially new ones not already here.