Anthidium porterae Cockerell, 1900
Apocynaceae: Asclepias sp. Asteraceae: Cirsium sp.; Erigeron compositus; Liatris sp.; Psilostrophe sp. Boraginaceae: Phacelia distans, P. robusta. Fabaceae: Dalea candida var. oligophylla; Hoffmannseggia sp.; Lotus sp.; Medicago sativa; Melilotus officinalis; Petalostemon sp.; Psoralea tenuiflora; Psorothamnus sp. Loasaceae: Mentzelia multiflora. Plantaginaceae: Penstemon sp.
Both sexes of this species are easy to recognize by the depressed apical rim of female T6 laterally projecting into a distinct ventral lobe and the median discal carina of male S6 distinctly projecting as a long spine. The female of A. porterae is similar to A. cochimi in the weakly convex clypeus with apically hooked or wavy hairs, the tomentum on the outer surface of hind basitarsus, and the depressed apical rim of T6 slightly projected laterally into a small ventral lobe; however, in A. porterae the preapical labral projections are large and distinct, and T6 is distinctly elevated along the midline with the ventral lobe more strongly projecting. In A. cochimi the preapical labral projections are nearly absent, barely indicated as an elevated ridge near to the apex of the median furrow and T6 is not elevated along midline.
This species occurs from San Luis Potosí in Mexico to Utah, Wyoming, and Colorado in the US.