Key to species of Anthidium

1 Body black; female mandible expanded apically, with dorsal tooth as broad as ventral tooth and much broader than middle teeth; T4-T5 with four yellow spots joined by thin yellow line...................................... A. ardens Smith

- Body light tangerine orange; female mandible with dorsal tooth much narrower than ventral tooth, similar in size to middle teeth; T4-T5 with four well separated yellowish white spots......................................... Anthidium sp1