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For Insects, Spiders & Their Kin
For the United States & Canada
Tiny Chryso - Phyllotreta striolata

Tiny Chryso - Phyllotreta striolata
Nosehill Park, Calgary, Alberta, Canada
May 9, 2009
Size: 2.2 mm
Sweepnetted from prairie; looks to be a species of Phyllotreta...

Phyllotreta, sure

NDSU Entomology Dept
has four species of Phyllotreta keyed out in their online flea beetle guide..

P, striolata
From the key here and description here