This species has been very rarely collected. It was known only from the type until a specimen was found in the University of Arizona Insect Collection from the Santa Catalina Mountains. Rick Westcott and Chuck Bellamy went to the locality of that specimen and collected 7 more, and wrote a note about the species (Westcott, R. L. & C. L. Bellamy. 2004. The rediscovery of Acmaeodera horni Fall (Coleoptera: Buprestidae). The Pan-Pacific Entomologist 79(3/4):250-251). The locality where they collected was subsequently burned in a wildfire. As far as I am aware, the species hasn't been collected again until now. Collected by Norm Woodley, on flower of Fallugia paradoxa, photos by Steve Lingafelter.