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Photo#151900
Found in Portland Oregon in mid October - Boisea rubrolineata

Found in Portland Oregon in mid October - Boisea rubrolineata
Portland, Oregon, USA
October 13, 2007
Size: half inch in body length
Found hundreds of these bugs clustered on the outside of my brother-in-law's house in SE Portland, Oregon in mid October. There were also some number of ladybugs around. So I thought they were the larvae of the ladybugs but browsing through ladybug pictures, they don't have enough similarities. These have longer antennae for one. Surprisingly, the bugs only clustered on my brother-in-law's house but not the neighbors'. Don't know if the stucco finish has anything to do with it (e.g. trapping heat under the sun etc). Underneath their wings, they have reddish/orange patterns on the abdomens.

Looks like
Boisea rubrolineata - Western Boxelder Bug in the guide here

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