| 1a. | Altitrunk and gaster lacking in long erect hairs on dorsum; gena lacking erect hairs; postpetiole broader than long (viewed from above); propodeal spines as long or longer than distance between tips | A. tennesseensis |
| 1b. | Altitrunk, gaster, and gena with erect hairs; postpetiole longer than broad; propodeal spinesnormally shorter than distance between tip | 2 |
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| 2a. | Postpetiole very broad posteriorly; posterior end > 1.5× width of anterior end; base of antennal scape (viewed from side) lobate and strongly thickened, angular n | A. treatae
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| 2b. | Postpetiole < 1.5× width of anterior end; base of antennal scape not lobate | 3 |
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| 3a. | Apical (terminal) 4 segments of antenna lighter in color and contrasting with darker basal segments; legs and fore-coxa may be greyish-brown; propodeal spines directed upward and more than half as long as the slope ("declivity") of the propodeum; prominent protuberances on the mesonotum that extend above the level of the pronotum; pronotum with dorsal rugae (faint to distinct); surface not smooth and glossy | A. fulva
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| 3b. | Antennal segments all the same color; legs and coxae not infuscate and distinctly contrasting in color with altitrunk; propodeal spines relatively short; low (not prominent) protuberances on the mesonotum | A. rudis complex |
