Anthidium emarginatum (Say, 1824)
The following biological observations have been published for A. emarginatum in the broad sense and may have also included A. atrifrons (see comments below): Davidson (1895) found several nests in the ground, inside abandoned nests of Anthophora (Apidae). The cells and nest plug were made with trichomes of Pseudognaphalium canescens and P. stramineum (Asteraceae). The trichome collecting behavior from stems of Cirsium undulatum was briefly described by Hicks (1926).