Metasomal tergite I. Sexual dichromatism and dimorphism in species of A. (Tetrasphaeropyx): (a) sclerites of males tend to be darker than in females; (b) metasomal tergites of males tend to be more coarsely sculptured than in females. Also (not shown), (c) antennal segments (flagellomeres) tend to be shorter in males than in females; (d) ocelli tend to be larger in males than in females.
