Here's a good comparative photo of Acmaeodera tubulus (broadly distributed in eastern North America) versus A. neglecta, which is distributed primarily in the southcentral U.S. north to Missouri. The lower left individual is A. neglecta and the others are A. tubulus - note the coarser and larger punctures of the elytra on A. neglecta, and the irregular "C"-shaped markings on the elytra, caused by longitudinal coalescence of the humeral and premedial spots, is also typical of this species. Both species are among the earliest spring buprestid species to appear, but in Missouri A. neglecta is most often associated with glade habitats, while A. tubulus is a habitat generalist.