Subject: NorCal bug coming up drain (septic system)
Location: San Francisco Bay Area
November 5, 2016 12:27 pm
I’ve seen a few of these alive in my bathroom sink. They seem to be coming up from the drain. They are fast-moving, and this one is about 1.5″ long. I live in the San Mateo hills south of San Francisco, and we are on a septic system here. These bugs have been spotted in September and October.
Based on this BugGuide image, we are confident that this is a primitive insect in the order Microcoryphia, known as a Bristletail. According to BugGuide: “outdoor grassy or wooded environments: under bark, in leaf litter, rock crevices, or under stones; not normally found in homes, does not breed indoors, and not considered a pest” and their food is “algae, lichen, moss, decaying vegetation; usually feed at night.”