Lewis & Short

Sălăpĭa, ae (also contr. Sălpia, Vitr. 1, 4 fin.; cf. Σαλπία, App. B. Civ. 1, 52), f., a city in Daunian Apulia, now Salpi, Plin. 3, 11, 16, § 103; Liv. 24, 20; 27, 28.
Hence,

    1. 1. Sălăpīnus, a, um (also Sălpīnus, Luc. 5, 377 Cort. N. cr., and Sălpīni, Vitr. 1, 4 fin.), adj., of or belonging to Salapia, Salapian: palus, Luc. 5, 377.
      In plur.: Sălăpīni, ōrum, m., the inhabitants of Salapia, the Salapians, Cic. Agr. 2, 27, 71.
    2. 2. Sălăpĭtāni, ōrum, m., = Salapini, the inhabitants of Salapia, Liv. 27, 28.