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Photo#321740
Prickly Pear Weevils - Cactophagus spinolae - male - female

Prickly Pear Weevils - Cactophagus spinolae - Male Female
UCI Preserve, Orange County, California, USA
August 16, 2009
Size: 5-6cm
I found many of these large weevils on prickly pear cacti yesterday. Best guess is Cactus Weevil (Metamasius spinolae). They were on Opuntia. I'm not a cactus expert but Opuntia littoralis is the common prickly pear around here, rather than O. basilaris. Metamasius spinolae is listed as 15-25mm in Evans and Hogue, and I'd swear these were noticeably larger than that; but size can be difficult to judge. The elytra are grooved.

Moved

Moved
Moved from ID Request.
In case you are wondering why it's in a different genus than you suggested: it seems that the taxonomists are going back and forth between two synonyms. As far as I can tell this is the current one.

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