Eversible-sacs
Guides
Bezzia varicolor
biting midge
Bezzia varicolor is a species of biting midge in the family Ceratopogonidae, first described by Coquillett in 1902. The species has been the subject of morphological study focusing on female-specific abdominal structures. Females possess distinctive eversible sacs attached to internal dorsal apodemes of the tergites. The function of these structures remains unresolved, though glandular activity has been ruled out by histological examination.