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True Bug under dead Opuntia pad, Chelinidea vittiger? - Chelinidea hunteri - male

True Bug under dead Opuntia pad, Chelinidea vittiger? - Chelinidea hunteri - Male
Picture Rocks, NW of Tucson, Pima County, Arizona, USA
February 17, 2009
Size: 10mm

Can you explain how this indi
Can you explain how this individual matches this part of the description? "Lateral margins of collar parallel sided, collar sharply delimited by a deep incisure from the rest of pronotum"

Maybe I don't know what is meant by the collar.

This may help...
This is a close-up of the collar in a different specimen.

BTW, one feature that I notic
BTW, one feature that I noticed that doesn't seem to get much notice in the descriptions is the posterior edge of the pronotum. On hunteri, it seems to be very rounded. On the others, it's more angular. I say that just from the pictures I've seen.

Thanks. I was looking at it t
Thanks. I was looking at it trying to place my entry:

which I've concluded is probably vittiger even though it doesn't match all the items in the description. I noticed the shape of this feature is very dependent on the angle from which the photo is taken.

Hind edge of pronotum
does seem to be angular in most of the other species, but some variants of C. vittigera (judging by illustrations in Herring 1980) have a similarly rounded hind margin.

Moved from Chelinidea.

By comparison
with UAIC specimens and the detail that Swani mentioned, it's hunteri

Not vittiger but...
one of the other three species. Characters of the profemur and anterior pronotal angles help to separate but most of the other characters are based on coloration. If I had to venture my opinion, I'd say probably C. hunteri but in no way would I suggest placing this beyond genus.

This guy was so immaculate and fresh that I'm not sure he already had his final colors.

Valid point...
and I usually forget to consider that possibility so I thank you. Additionally the review of Chelinidea states some C. vittiger retain this very pale coloration and a few "authentically identified" specimens in the museum look similar to this one. Nevertheless that shouldn't change the future destination of this photo. The other three species are also pale and can be found in AZ. I'm pretty sure that C. canyona and C. tabulata can be eliminated from consideration since they possess rather prominent projections at the anterior pronotal angles. However, without a lateral shot of the profemur and/or a more detailed shot of the anterior pronotal angles, I still think this should remain at genus.

I'll get those shots
when it comes out of the freezer

Did you take those shots? They would be a nice addition.

No, the microscope at the UAIC
can do what my camera cannot. We may get imaging equipment soon though

Oh wonderful!
That gives either a new species for the guide or another example of variability within a species, both excellent additions to the guide. I look forward to the shots.

For the femur shot, we need to know whether the profemur is dorsally carinate or rounded and the number/arrangement of teeth on the ventral surface. The anterior pronotal angle will either have a small notch or be smoothly rounded.

Wish I could help...
...but I have no idea :(

Just want to thank you for finding another amazing bug and posting yet another wonderful bug image!

My pleasure:
there aren't many beetles yet, and I find these true bugs very attractive

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