According to Brock and Kaufman (2003), the widespread and ecologically variable butterfly "species" of western North America known as the Square-spotted Blue (Euphilotes battoides) is in fact almost surely a complex of several distinct species, but the systematics of this group requires further study.
- Brock, J.P. and K. Kaufman. 2003. Butterflies of North America. Houghton Mifflin, New York.
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