Anthidium atripes Cresson, 1879
Asteraceae: Agoseris glauca; Chrysothamnus sp.; Cirsium sp.; Townsendia incana. Boraginaceae: Cryptantha micrantha; Phacelia crenulata. Brassicaceae: Stanleya pinnata. Fabaceae: Astragalus aequalis, A. beckwithii, A. douglasi var. parishii, A. filipes; Dalea searlsiae; Hedysarum boreale; Lathyrus brachycalyx ssp. zionis; Lotus argyraeus, L. davidsonii, L. nevadensis, L. nevadensis var. davidsonii, L. oblongifolius, L. strigosus var. hirtellus; Lupinus sp.; Melilotus officinalis. Malvaceae: Sphaeralcea grossulariifolia. Plantaginaceae: Penstemon comarrhenus, P. leiophyllus, P. thompsoniae ssp. jaegeri. Polemoniaceae: Gilia inconspicua.
Both sexes of this species are similar to A. atripoides in the usually large (~8–11 mm) and robust body size of the female, the weakly and sparsely punctate depressed marginal zones of T3–T5 without distinctive smooth and shiny distal margins, and the shape of the genitalia and associated sterna of the male. Females of A. atripes can be distinguished from all other Nearctic Anthidium except A. atripoides and some A. atrifrons by the black pubescence of the legs. From dark haired A. atrifrons it can be separated by the sparse punctation of the marginal areas of the terga, the lack of maculations on T5 and T6 and the six-toothed mandible. From A. atripoides it can separated by the thinner apical margin of the clypeus (compare Figs. 53 and 54), and the fore and mid basitarsi, which are more densely covered with tomentum; the pronotal lobe is also usually yellow. Smaller females of A. atripes can be confused with A. emarginatum but in the latter species the outer surfaces of the fore and mid basitarsi are sparsely covered by tomentum (integument largely visible among hairs) and the integument of T1–T5 is shinier, with the depressed marginal zones more coarsely and densely punctate (≤ 1 PW) medially. The male differs from that of A. atripoides in the shape of lateral lobe of T7, S4, and S6.
Intermediate elevations in the mountains west of the Rocky Mountains in California, Colorado, Idaho, Nevada, Oregon, and Utah in the US, and adjacent Baja California in Mexico. An azonal record, a single male, from Antioch, California is anomalous.