Why do hairy insects have a bald abdominal sterna?

Hairy insects often have bald abdominal sterna to reduce friction and enhance movement efficiency. The absence of hair in this area allows for smoother abdominal flexion and contraction during activities such as flight and mating. Additionally, a bald surface can aid in thermoregulation, as it enables better heat dissipation. This adaptation ultimately contributes to the insect's overall survival and reproductive success.