This is a female Hylaeus (masked bee), measuring 7.25 mm, found on Pyracantha.
This is a largely black bee, with a partly-red abdomen, and yellow markings on the face, pronotal collar and pronotal lobes. The bee’s tibae, basitarsi and tarsi are mostly orange, with some yellow on the upper/basal hind tibiae. The apical (rear) half of each of the bee's forewings is dark. ABDOMEN: The bee’s abdomen is glassy and mostly black. These parts of the abdomen are red: the first segment (T1 and S1); and the basal 2/3 of the second segment (T2 and S2). Most of the remaining abdomen is black, except for narrow red areas at the bases of S3-S5; and a small central area of S6.
This female was found on the same Pyracantha bush as the male shown here: https://www.inaturalist.org/observations/205272909
Two hawks on radio tower located on Sligo Creek Golf Course, Silver Spring, MD
Reddish spot on abdomen diagnostic for this area?
Growing on dead ginkgo log
Canon PowerShot SX620 HS (4.5mm-112.5mm f/3.2-6.6 lens, 20.2MP).