Synonyms and other taxonomic changes
First described in 1850 by Étienne Mulsant
as a subgenus of Exochomus
Two species in North America:
Length 5.0 to 7.0 mm, width 4.0 to 6.25 mm.(1)
A. tripustulatum - New York to Florida, west to Colorado and Texas.
A. plagiatum - Louisiana to California, north on the Pacific coast to Oregon.
The range map for Axion in Gordon, 1985, is mislabeled, showing A. tripustulatum in the West and A. plagiatum in the East.
Gordon, 1985, especially pp. 611-619, figures 504-507.(1)