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Photo#223623
Weevil - Chalcodermus collaris - female

Weevil - Chalcodermus collaris - Female
Sand Springs, Osage County, Oklahoma, USA
September 9, 2008
Size: 5mm (3/16")
A weevil....weeviling....
Notice how it is digging into the stem. What is it after?

Please help with ID.

Moved
Moved from Chalcodermus.

ID and behavior
Chalcodermus collaris Horn. The weevil is feeding, not ovipositing. The area is too large for oviposition. When preparing to oviposit the weevil chews a hole close to the diameter of her rostrum and as deep as the length of the rostrum up to the antennal insertion. She pulls out the rostrum, turns around and inserts her ovipositor and deposits the egg. Often then she turns again and scrapes some plant tissue over the egg to protect it.

What is the hostplant?
always of interest . . .

 
looks like C. collaris Horn
*

 
....
not sure

Behavior.
Female beetles of many kinds will make cuts like this before ovipositing, to help protect the egg from dessication and hide it from egg predators.

 
it's "desiccation."
(Wow, that Blanchard is certainly an insufferable pedantic type!)

 
thank you for being pedantic --
it's a great virtue for anyone dealing with insects (Full disclosure: I used to double-S that word, too; I'm not a native speaker, though :)

 
Then, to be more pedantic,
it's from the Latin "siccus" which means dry.

 
that much i know
*

Chalcodermus
Probably collaris.

 
thanx -- nice to know
*

nice... and i believe new for the Guide on a genus-level
looks like it's (she's?) determined to inflict serious damage :o]
maybe preparing home for the brood? maybe to have the shoot dry out upstream of the cut? can't tell you more, but the beetle is very distinct (incredible pronotal sculpture, for one) and someone will hopefully recognize it

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