Key to eastern US Crematogaster

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This worker key is based on:

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  • Thoracic dorsum covered with distinct, strong, vermiculate rugae; a small, dark colored, arboreal species usually found only in cypress swamps; distribution possibly co-extensive with the bald cypress in southern U.S. (type specimens mislabeled as to locality, not found in California) . . . . . Crematogaster vermiculata
  • Thoracic dorsum without vermiculate rugae, or if faintly present on front of pronotum and base of epinotum, then not found in this habitat . . . . . 2

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  • Pronotum rugose on each side and with a median, smoother sulcus; when seen from the front, the high, median mesonotal carina may be seen through this sulcus almost like a gun sight; a small, dark colored, arboreal species, found nesting in live-oaks and other trees along the southern Texas gulf coast and on into Mexico. . . . . . Crematogaster rifelna