Identified by Jack Neff.

This female bee was found feeding on camphorweed (Heterotheca subaxillaris), with many other similar females, and with Melissodes coreopsis males like the one shown here https://bugguide.net/node/view/2197507.

Some of the traits of the female bee shown here are: (1) Face: The clypeus, labrum and bases of the bee’s mandibles are black, with some dark red on the tips of the mandibles. (2) Vertex: This female bee has almost entirely white hairs on the vertex, with some sparsely-scattered gray hairs. (3) Thorax: The central areas of the bee’s scutum and scutellum are covered in dark hairs, with light hairs bordering the edges of the scutum and scutellum. The sides of the thorax (the mesepisternum and the pronotal lobes), are covered with light hairs. (4) Abdomen: T1 is edged with a translucent rim. The bands of hair on T1-T3 are almost entirely light. The central area of T2 is pitted. There are sparse pits on the central area of T3, with some dark hairs in the pits. On T4, there is a white, dense band of light-colored hairs, but there are some dark hairs between the rim of T4 and the light-colored hair band. T5 and T6 are covered mostly with dark-brown hairs, and with pale hairs laterally; there are some light-brown hairs on T6. (5) Scopal hairs: the hind-leg scopal hairs of the female bee are feathery and primarily ivory and pale yellow, with dark-brown hairs on the inner basitarsi.