(the Air Pump; abbrev. Ant, gen. Antliae; area 239 sq. deg.) A southern constellation that lies between Hydra and Vela, and culminates at midnight in late February. It was named Antlia Pneumatica by the French astronomer Nicholas L de Lacaille (1713–62), who charted the southern sky in 1751–2. The IAU adopted the shortened form in 1922.