Ergatomorph wingless males in Technomyrmex vitiensis Mann, 1921 (Hymenoptera: Formicidae)

Ergatomorph wingless males are known in several species of the genus Technomyrmex Mayr, 1872. The first record of these males is given in T. vitiensis Mann, 1921. In comparison with winged males, wingless males have a smaller thorax and genitalia, but both forms have ocelli and the same size of eyes. Wingless males seem to form a substantial portion (more than 10%) of all adults in examined colony fragments. Wingless males are present in colonies during the whole year, whereas the presence of winged males seems to be limited by season. Wingless males do not participate in the taking care of the brood and active foraging outside the nest. Males of both types possess metapleural gland openings. Beside males with normal straight scapes, strange hockey stick-like scapes have been observed in several males. The cause of this divergence is unclear.