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Photo#120287
Milkweed-eating Beetles - Macrodactylus subspinosus

Milkweed-eating Beetles - Macrodactylus subspinosus
Holland, La Crosse County, Wisconsin, USA
June 20, 2007
These beetles are EVERYWHERE. They were feeding mostly on milkweeds, and also some Siberian Elm.

Macrodactylus subspinosus
see http://bugguide.net/node/view/4108/bgimage

This is a common beetle in Wisconsin (see http://entomology.wisc.edu/~young/scarab/maps/macsubsp.gif). I've never seen so many on a single plant, though. Quite amazing.

I saw these last weekend also
I saw these last weekend also in Wisconsin on milkweed. Curious as to what they are. That is a crazy amount of them!


Are these on just one Milkwee
Are these on just one Milkweed plant ? Wonder how it supported all of them ?

Amazing!!
Amazing!! It's a good thing they don't eat people or pets!

 
Not eating....
I don't think they are 'eating' the milkweed. This kind of aggregation is usually associated with mating or "sleeping." If they DO start eating milkweed, you'll have a 'scoop,' and all the monarch caterpillars will be in trouble:-)

 
I agree.
I've seen breeding orgies like this and any available plant seemed to suffice.

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