Rear face of the propodeum rounded or with at most low, rounded ridges or protuberances, but never with teeth, spines or thin flanges (fig. a). 并胸腹节没有刺或齿突。

[初步结果：火蚁属]

Rear face of the propodeum armed with teeth or spines which vary from short and angular (fig. aa) to long and thin, or occasionally propodeum with thin, elongate flanges. 并胸腹节有刺或角状物突出。

[由此继续向下检索]