Anthidium hallinani Schwarz, 1933  

This species is most similar to A. aztecum in the overall shape of T6 of the female and T7, genitalia and associated sterna of the male. However, in the female of A. hallinani the depressed apical rim of T6 is only visible medially, with the median emargination continuing basally into a short carina, whereas in A. aztecum it is visible across almost its entire width and lacks the short carina above the median emargination. In the male, S4 is more distinctly emarginate medially, with the apical brush denser and slightly broader (~0.4x sternal width) than in A. aztecum; S6 is not as sharply projected laterally and the distal margin is more distinctly truncate than in A. aztecum; the apical process of S8 is broader basally than in A. aztecum, projecting on median half of distal margin. Also, both sexes of A. hallinani have the tegula and legs ferruginous, with more extensive yellow markings on the mesosoma than in A. aztecum.