Last summer at Bodega Head, Sonoma County, I captured an image of what appears to be a yellow-faced bumble bee, Bombus vosnesenskii, nectaring on a bull thistle. Was it? It could be Bombus caliginosus, according to bumble bee expert John Ascher on iNaturalist. Bohart Museum of Entomology research associate Tom Zavortink mused that it's difficult to distinguish between a vosnesenskii or caliginosus "without examining the length of the malar space, which is not visible in your photo. In fact,...
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