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宽结大头蚁ＰｈｅｉｄｏｌｅｎｏｄｕｓＳｍｉｔｈ筑巢于土中。３月中、下旬开始出巢活动取食，５、６月为繁殖高峰，繁殖期巢内各虫态个体总数高达１４８６５头。７月中旬有翅雌雄成蚁羽化，１１月下旬开始越冬，越冬期巢内个体数大减，仅以成蚁和少量幼蚁越冬。该蚁是马尾松毛虫卵和初龄幼虫的重要捕食性天敌，对人工挂放于林间的第２代马尾松毛虫卵的最高捕食率达５５．３３％。
Wide knot large-headed ants PheidolenodusSmith nest in the soil. In mid-March and late-stage, the activity of feeding out of the nest was started. The breeding peak was in May and June. The total number of individuals in the nest during the breeding period was as high as 14,865. In mid-July, the winged male and female ants became eclosion, and began to winter in late November. The numbers of individuals in the nest during the winter were greatly reduced, and only the ants and a few young ants overwintered. The ant was the predatory natural enemies of Dendrolimus punctatus eggs and first-instar larvae, and the highest predation rate was 55.33% on the second generation of Dendrolimus punctatus eggs which were placed in the forest.