Key to Proceratium species in or possible in MS and AL (from Brown 1979 and Baroni Urbani and de Andrade 2003)
1   

Petiole rectangular; anterior border of clypeus unarmed, straight; palp formula 2,2

....2
  Petiole convex; anterior border of clypeus subconvex, rectangular, or triangular; palp formula 3,2 or 4,3
...4
2(1)    Larger size, total length (TL) greater than 3.7 mm and HW > 0.75 mm; frontal area broader than 1/3 of the maximum HW
....croceum (Roger)
  Smaller size, TL < 3.5 mm and HW < 0.75 mm; frontal area at most slightly more than 1/4 of the maximum HW
...3
3(2) Frontal area about 1/4 of HW, frontal carinae gently diverging posteriorly; standing hairs on petiole and gaster short and sparse
...crassicorne Emery
  Frontal area broader than 1/4 of HW, frontal carinae strongly diverging on the two anterior thirds; standing hairs on petiole and gaster longer and more dense
...silaceum Roger
4 (1)   Scapes not reaching the margin of vertex; first segment of funiculus approximately 1/5 longer than broad; funicular segments 2-10 about as long as broad or slightly broader than long; mid basitari shorter than fore basitarsi; first tergite of gaster strongly angulate on the curvature
...5
  Scapes reaching or surpassing the margin of vertex; first segment of funiculus about 1/2 longer than broad; funicular segments 2-10 longer than broad; mid basitarsi as long or longer than fore basitarsi; first tergite of gaster at most weakly angulate on the curvature
...creek de Andrade
5(4) Gaster short and opaque, with short dense hairs
... pergandei (Emery)
  Gaster longer and shinier, with longer, sparser hairs
...chickasaw de Andrade
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