Anthidium maculosum Cresson, 1878
Agavaceae: Agave sp. Apiaceae: Angelica scabrida. Asteraceae: Aster sp.; Chaenactis douglasii; Chrysopis villosa; Chrysothamnus viscidiflorus; Cirsium calcareum, C. vulgare; Corethrogyne filaginifolia; Ericameria linearifolia; Erigeron rhizomatus; Grindelia camporum; Gutierrezia sarothrae; Helianthus annuus, H. floridanus, H. maximiliani; Heterotheca villosa; Hulsea callicarpha; Isocoma acradenia; Senecio ionophyllus, S. spartioides; Solidago californica. Boraginaceae: Eriodictyon trichocalyx; Phacelia alba, P. heterophylla, P. pulchella, P. ramosissima, P. robusta. Convolvulaceae: Convolvulus arvensis. Ericaceae: Arctostaphylos sp. Fabaceae: Astragalus douglasii var. parishii, A. flavus; Cercidium sp.; Dalea searlsiae; Lotus argophyllus, L. corniculatus, L. humistratus, L. nevadensis var. davidsonii, L. scoparius, L. strigosus, L. utahensis; Lupinus argenteus; Melilotus officinalis; Prosopis juliflora; Psorothamnus emoryi, P. scoparius. Iridaceae: Gladiolus sp. Lamiaceae: Marrubium vulgare; Monarda austromontana; Monardella sp.; Poliomintha incana; Salazaria mexicana; Salvia dorrii, S. riparia; Stachys albens, S. bullata, S. pycnantha; Trichostema laxum. Malvaceae: Sphaeralcea grossulariifolia. Orobanchaceae: Cordylanthus nevinii. Plantaginaceae: Antirrhinum sp. Polemoniaceae: Gilia aggregata. Rosaceae: Fallugia paradoxa. Plantaginaceae: Penstemon linarioides, P. thompsoniae ssp. jaegeri. Verbenaceae: Verbena hastata, V. lasiostachys.
The combination of hind tibial carina and dull frons with coarse, sparse punctures will separate this species from all other North American Anthidium except A. chamalensis, A. rodriguezi, and A. parkeri. From the former two, A. maculosum can be separated in the female by the apical margin of T6 with only two teeth, and in the male by the F1 slender, longer than F2 and F3 combined and the absence of stout spines on the mesepisternum ventrally. A. maculosum is most similar to A. parkeri, from which it can be easily separated in the female by the denser tomentum on the outer surfaces of the basitarsi and T6, which is slightly depressed above preapical carina with distinct lateral projections. The male differs from A. parkeri in the digitiform lateral lobe of T7 and the shape of S6 and S8. The distal margins of the terga in both sexes of A. maculosum are also thin, almost lamellate, whereas they are unmodified in A. parkeri.
Anthidium maculosum is found from Honduras to Oregon, Utah, Colorado and Texas in the western USA.