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Photo#209674
Yellow Douglas Fir Borer - Centrodera spurca - Centrodera dayi

Yellow Douglas Fir Borer - Centrodera spurca - Centrodera dayi
Salem, Marion County, Oregon, USA
August 2, 2008
Size: 30mm+/-
Found on the wall neat post light.
I think I'm on the right track on this one

Moved

Moved
Moved from Beetles.

Winner:-)
Ding-ding-ding-ding! Right on with the ID. Neat insect, one of my favorite Oregon beetles.

 
Question:
How do you separate from something like. Centrodera dayi?

 
Most likely Centrodera dayi L
Most likely Centrodera dayi Leech, 1963. The broader, shorter elytra give this species a chunkier look. The color is not as opalescent as in C. spurca, especially near the humeri. The apices of the elytra do not appear to be dentate as they should be for C. spurca (though difficult to see). If you have the specimen in hand you look at the condition of the hairs on the basal half of the elytra to see if they are conspicuous and depressed, recruved (spurca) or not conspicuous and suberect (dayi). Also the hairs on the male antennae are either satiny (spurca) or bristly (dayi). Both species overlap in distribution.

 
beetle
Thanks, I had another one last night.
Michel Kleinbaum

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