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Bean Leaf Beetle - Cerotoma trifurcata

Bean Leaf Beetle - Cerotoma trifurcata
Harvard, Worcester County, Massachusetts, USA
June 17, 2005
Size: 4mm
Nice symetrical pattern on this beetle. Can it be identified?

Bean Leaf Beetle
Cerotoma trifurcata. Highly variable in color, and may lack the squarish spots but the triangular one is always present; see some examples.

how much variation there can be. Thanks for the info Robin.

Variation in the bean leaf beetle
Cerotoma trifurcata's variation is mostly in color; however, their markings can also be variable. I've yet to see one of these critters (and I've seen more than 5,000 during the past 4 years -- I'm doing my Ph.D on these) that doesn't have a black scutellum (the triangular plate in front of and between the forewings). Some researchers in the 80's in Louisiana classified the color variation into 7 groups. However, most folks just classify them as either red or yellow.

Good info
Thanks for clearing up the amount of variability.

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