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beetle 57 - Cryptocephalus arizonensis

beetle 57 - Cryptocephalus arizonensis
Mt Lemmon, Pima County, Arizona, USA
May 21, 2012
8,000 to 9,000 ft elevation on oak

Moved from Cryptocephalus sanguinicollis.

I was a bit hesitant to move this, as Michael and =v= have far(!) more experience with beetles than I. But the points in my comment below (after Margarethe's comment), taken together, seemed compelling to me. We all make mistakes (I know I do often enough!). And if I made a mistake here, I trust Michael or =v= can correct me...and move this back to C. sanguinicollis.

Moved from ID Request.

Cryptocephalus sanguinicollis Suffrian

The other ones in the guide
all have black legs?

Margarethe is onto something...this seems to be C. arizonensis
To get to C. sanguinicollis requires "legs black" at couplet 29 in the key from the 1968 revision of Cryptocephalus by White[cite:212163,15].

The couplet separating arizonensis from sanguinicollis is:

28a. Elytra dark and distinctly metallic bluish or greenish; Arizona, Texas........arizonensis arizonensis Schaeffer
28b. Elytra black and shining, not bluish or greenish; various localities..................29
I think I see some faint greenish to the elytra in Jillian's photo here, which would support arizonensis...though it's subtle and could be reasonably disputed.

But, beyond any greenish tinge to the elytra, the leg color seems to be a clear discriminant...note that the 1st sentence in Schaeffer's original description of C. arizonensis indicates the legs in that species are reddish; whereas White's key states the legs in sanguinicollis are black.

Also, though perhaps less compelling, White's discussion of arizonensis arizonensis on pg. 31 indicates the vast majority of specimens were from southeast and north central AZ, in accord with Jillian's post here. On the other hand, White's discussion of sanguinicollis sanguinicollis on pg. 83 gives the range of that species as CA, NV, UT, ID, and WA, while all the current BugGuide posts for C. sanguinicollis are from the coastal half of California, and the map here gives (Alta and Northern Baja) California as the range for the latter. Habitat elevation may be significant too: all the current CA posts are from low elevations (i.e. under 2500', often much less); whereas Jillian gave an elevation of 8000-9000' here, and the type locality for C. arizonensis is in the Pinal Mountains of AZ, which are mostly above 4000' and range up to 7848'.

Finally, Schaeffer recorded arizonensis from did Jillian here; whereas sanguinicollis is described as having various hosts other than oak (e.g. willow, blackberry, rose, strawberry, wild licorice, and prunes).

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