Two species of stream spreadwings (Archilestes sp.) live in Arizona: the Great (A. grandis) and the California (A. californicus) Spreadwings. These species are easily separated from pond spreadwings (Lestes sp. ) by their considerably larger sizes.
The Great and California Spreadwings occupy similar habitats, in particular streams bordered with trees and bushes (esp. willows) and sometimes ponds. The two species can be found at a same location, but have a different distribution: the Great Spreadwing resides throughout the state whereas the known distribution of the California Spreadwing is limited to the Southeast corner of the state (Paulson 2009).
The two species are separated in the field based primarily on the thorax color pattern and, in males, the shape of the appendages.