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The genus Diacamma comprises about 44 known species of ants in the subfamily Ponerinae. Colony size ranges from 12 to 450 individuals, at the low end of the spectrum for ants in general. Among relatively well-studied species, the mean number of workers within the colony is 82 in D. indicum, 129 in D. australie, 214 in D. cyaneiventre, 230 in D. ceylonense, and 273 in D. “nilgiri”. In most species, all stages of brood are present throughout the year. In D. ceylonense four larval instars have been identified. The larval period is about 21 days, with about a 50-fold increase in weight. The pupal period, likewise, is about 21 days.