I live in along the south-central coast of Oregon in the U.S. and a we see a lot of lined June beetles this time of year. I always thought we had the Ten-Lined June Beetles here, but I’m seeing that some have ID’d them as Long-Haired June Beetles. I have studied the photos of the two different beetles on iNat and in Bug Guide (and detailed descriptions there), but I cannot figure out how to tell one from the other. I would love to help with IDing these on iNat, but I’m not confident in telling them apart. Is there a way to differentiate one from the other when looking at photos?
I think the antennae of the long-haired are more of a single piece, while those of the ten-lined are feathery. Maybe? Don’t trust me on this…
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Tricolor (orange, black, white). Elytra integument black; covered in yellow/golden scales. Pronotum with erect hairs in central area.
P crinita
Brown, body with yellow and white scales each located within a puncture; elytra with broad white stripes; antennal plates very large.
P decemlineata
Copied from bugguide - orange and black vs yellow and brown
I wouldn’t trust all the photos. This seems an obvious mis-ID, for example: https://bugguide.net/node/view/2386878
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That seems rather like the famous controversy about the dress – black and blue vs. gold and white.
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Thank you. I was looking at the photos and relying too much on that to realize one was only black and the other only brown. My first thought was the difference in color, but then saw too many photos of both colors listed under each species. Thank you for your help.
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