Anthidium (Anthidium) rodecki are black, with light brown to ferruginous coloration on the tarsi, sterna, and tergal distal margins, and yellow maculations (Gonzalez and Griswold 2013). Females have white pubescence except for light brown to ferruginous hairs on the inner tarsi. The outer fore and mid basitarsi are covered by tomentum. Females range in body length from 7.4–10.8 mm, and males range in length from 8.2–12.3 mm (Gonzalez and Griswold 2013).
(modified from Gonzalez and Griswold 2013)
Anthidium rodecki may be confused with A. paroselae and A. sonorense due to the combination of white pubescence, a weakly convex clypeus in profile with a straight apical margin, dull or weakly shiny terga with complete bands of yellow maculations, and tergal discs with fine and sparse punctures (Gonzalez and Griswold 2013). Female A. rodecki can be differentiated from A. paroselae and A. sonorense by the fringe of long hairs on the basitarsus, the absence of an anterior carina on the hind tibia, and T6 with a broad depressed apical rim. Male A. rodecki can be differentiated from A. paroselae and A. sonorense by the presence of a broad, rounded lateral lobe on T7, median apical brush of dense, reddish-brown hairs on S4, and the shape of S6 and S8 (Gonzalez and Griswold 2013).
Anthidium rodecki adults have been recorded in flight from May to early September, with peak activity occurring from June to the first half of July (Gonzalez and Griswold 2013).
Anthidium rodecki has been observed visiting Tetradymia tetramers (Asteraceae), and Psoralidium lanceolatum and P. polydenius (Fabaceae) (Gonzalez and Griswold 2013).
Nesting behavior is unknown.
Anthidium rodecki occur in the U.S. in Nevada, Utah, Idaho, Colorado, and Wyoming. They are restricted to sand dunes within the Great Basin, Colorado Plateau, Red Desert, San Luis Valley, and the western edge of the Great Plains (Gonzalez and Griswold 2013).