Subject: True Bug Colony?
Location: Coastal San Diego County
May 22, 2013 6:24 pm
Found these in my neighbors back yard…
Though this resembles a Hemipteran aggregation, it is actually a colony of Barklice or Tree Cattle. The look to us like Cerastipsocus venosus which BugGuide identifies as an eastern species, though the genus is reported from Arizona. We have not been able to substantiate any California sightings in our quick search, so they might have been accidentally introduced to your area. Barklice are benign creatures that feed on lichens and they will not harm trees and plants. Adults are winged and nymphs are boldly striped.