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Photo#74037
Red and black weevil - Rhodobaenus quinquepunctatus

Red and black weevil - Rhodobaenus quinquepunctatus
Gainesville, Alachua County, Florida, USA
August 30, 2006
Size: ~10 mm
This has a lot more black than others already in the guide, but I ruled out Palmetto Weevil because of the size, and it was on Ragweed, which is listed as a host for R. tredecimpunctatus.

Moved
Moved from Rhodobaenus.

A late answer
I see the discussion on this one is somewhat old, but for what it's worth, this species is Rhodobaenus quinquepunctatus.

Many Rhodobaenus sp. have a black phase, but most of these are tropical with the exception of R. quinquepunctatus, which does have a black phase R. tredecimpunctatus does not have a black phase. Also, this is not R. pustulosus, the other U.S. Rhodobaenus sp.

Nice picture and of a phase that is not as common.

 
Thanks so much, Nathan -
one of the joys of this site is that IDs get made often months or years after posting.

Moved
from Rhodobaenus tredecimpunctatus. I'm wondering if it could be the other species listed on the R. tredecimpunctatus info page, R. quinquepunctatus?

 
Stephen Marshall's book
Stephen Marshall's book pictures R. tredecimpunctatus and R. quinquepunctatus. The most immediate difference I see is that R. quinquepunctatus (image 371-6) has more black, including a huge spot at the apex of the elytra. R. tredecimpunctatus (image 371-7) is red at the apex of the elytra.

Yours has quite a bit more black than either of these that Stephen Marshall's book shows.

 
Hmmm...
it doesn't really narrow it down, does it - but thanks for the info! I hope an expert on these will pass by some time and give a response!

 
The third...
According to Google Image Search, there is no on-line image of the third Nearctic species, Rhodobaenus pustulosus. Still, the name of that species implies spots or depressions, not the nice continous black surface of yours.

Maybe yours is just a darker than usual form of R. tredecimpunctatus or R. quinquepunctatus, but now I am just gossiping about this poor unknown beetle.

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