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Both species are common. There are similar, rarer species elsewhere in the United States.

According to the last revision (Ravlin and Stehr 1984), the color differences between the species in this group are

marmoratus, analis, and apicifer: "Discal setae on thoracic notum black; thoracic pollen gray to yellow-gray; parafacial pollen silvery-white to off-white."

californiae and nivalis: "Discal setae on thoracic notum yellow to white or mixed with black (especially prevalent on the scutellar disc when viewed posterolaterally); thoracic pollen golden-yellow- to yellow; parafacial pollen golden-yellow to yellow."

I don't know how reliable these color differences are. I think there is overlap. The male genitalia are quite different.

Color of discal setae means color of small hairs. The major bristles are black in both species.