yucca beetle - Mycterus quadricollis
Pinyon Flats Campground off Hwy 74 in the San Jacinto / Santa Rosa Mtns, Riverside County, California, USA
May 8, 2008
Size: 5 & 6 mm
I first thought these were chrysomelids but the antennae look wrong. This is a male and female -- the male has fancier antennae and is a little smaller than the female. There were a lot of these feeding on yucca flowers. They were especially active at night but they were not hard to find in the daytime also.