Key to eastern US Crematogaster

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This worker key is based on:

1

  • 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

2

return to couplet #1

  • 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

3

return to couplet #2

  • Epinotal spines very short and distinctly in curved; thoracic dorsum smooth to weakly punctate, a small arboreal species common throughout the southeastern states from Texas to the Carolinas . . . . . Crematogaster ashmeadi

4

return to couplet #3

  • Pubescence suberect on at least head and thorax; erect hairs slender and numerous on thorax and gaster . . . . . 5
  • Pubescence appressed on head, thorax, and gaster; erect hairs either rather sparse on thorax and gaster or if numerous then somewhat bristle-like in appearance. . . . . . 6