Typical large carpenter bee, all black with some bluish/greenish reflections. Male has some lighter markings on pronotum, abdominal segment 1. Compare other Carpenter bees in range, such as X. varipuncta.
Utah, Nevada, California, north to Oregon, south into Mexico.
Forests and nearby meadows
Adults fly in late summer
The Hosts section on its Discover Life species page
lists known associations based on specimen records and images.
Milne describes life history and illustrates X. californica
, p. 861, fig. 497 (1)
Powell and Hogue, p. 353--cf. X. varipuncta
, fig. 457 (2)