Adelges cooleyi (Hemiptera: Adelgidae)
Cooley Spruce Gall Adelgid
Deming, Whatcom County, Washington
September 10, 2012

Old adelgid gall -- the mature nymphs emerged probably a month or so before this image was taken, through the holes visible near the needle attachments. Host is Sitka spruce (Picea sitchensis).