Anthidium (Anthidium) dammersi are black with yellow to cream maculations, and occasionally have brown antennae, mandible, sterna, legs, and tarsi (Gonzalez and Griswold 2013). Females have white pubescence except for the ferruginous hairs on the inner tarsi. Females range in body length from 7.5–8.6 mm (Gonzalez and Griswold 2013). Males have whitish pubescence on the inner surface of their tarsi. Males range in body length from 8.5–10.2 mm (Gonzalez and Griswold 2013).
(modified from Gonzalez and Griswold 2013)
Female A. dammersi can be easily recognized by the white sternal scopa, dull or weakly shiny terga, and T6 with a depressed apical rim across a truncate distal margin, which makes it unlikely that it will be confused with another species. Male A. dammersi may appear similar to A. atrifrons because of the similarly shaped T7, but can be differentiated by the shapes of the lateral lobes of S6 and T7 (Griswold and Gonzalez 2013).
Anthidium dammersi adults have been recorded in flight from April to June, with peak activity occurring from the last half of April to the first half of June (Gonzalez and Griswold 2013).
Anthidium dammersi is a generalist that has been observed visiting a variety of species of Asteraceae, Boraginaceae, Fabaceae, Lamiaceae, Loasaceae, and Orobanchaceae. Anthidium dammersi has shown a strong preference for Astragalus (Fabaceae) (Gonzalez and Griswold 2013).
Nesting behavior is unknown.
Anthidium dammersi occur in southern California, Arizona, southwest New Mexico, Nevada, Utah, and southwest Wyoming. Within Mexico, they are distributed throughout Baja California. They are found primarily in the Red Desert, Great Basin, Colorado Plateau, and Mojave Desert (Gonzalez and Griswold 2013).