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Photo#311424
Yucca Nitidulid Larva - Caplothorax melanopterus

Yucca Nitidulid Larva - Caplothorax melanopterus
University of Guelph campus (N43º31'47"W080º13'34"), Wellington, Ontario, Canada
July 23, 2009
Size: 7.0 mm
Many of these were found in the dying flower heads of ornamental Yucca.

Yucca beetle
I found these same beetles on the flowers of a yucca plant in SE PA. It seems that the beetles followed their host plant as it was planted farther north, away from its natural distribution.

 
Northern find
Indeed! I remember I was rather surprised to find this species in Ontario, on the same host plants year-over-year.