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Species Phyllotreta denticornis

 Tiny flea beetle - Alticini? - Phyllotreta denticornis - female  Tiny flea beetle - Alticini? - Phyllotreta denticornis - female  Tiny flea beetle - Alticini? - Phyllotreta denticornis - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Chrysomelidae (Leaf Beetles)
Subfamily Galerucinae (Skeletonizing Leaf Beetles and Flea Beetles)
Tribe Alticini (Flea Beetles)
Genus Phyllotreta
Species denticornis (Phyllotreta denticornis)
Explanation of Names
Phyllotreta denticornis Horn 1889
Size
2.5-2.8 mm
Identification
Elytra with only a narrow stripe, or, most commonly, two elongate spots each, or completely black. Dorsally coarsely punctate.

Male: antennal segments 4+5 strongly dilated; 6th with a spine on underside;
Female: antennal segment 5 longer (up to 1.5 times) than 6.
Range
WA-CA