In coastal scrub habitat. Burrows were positively associated with scrub oaks along the upper ridge and negatively associated with rosemary and lichens at lower elevation in the scrub. This individual was gently excavated from the entrance of her burrow and remained in torpor while I photographed her and then returned her to leaf litter near the burrow.
An entirely black female bee, 9.5 mm, found on yellow thistle (Cirsium horridulum). There were many Osmia chalybea, the host bee for Stelis ater, feeding on the same thistle and other neighboring thistles.