Lewis & Short

Stercŭlĭus, ii, m. [stercus], the deity that presides over manuring, Tert. Apol. 25; Macr. S. 1, 7; Lact. 1, 20 fin.; 1, 36; Serv. Verg. G. 1, 21.
Called also, Stercŭ-lus, Prud. στεφ. 2, 450; Stercŭtus or Stercŭtĭus, Plin. 17, 9, 6, § 50; Lact. 1, 20, 36; and, Stercenĭus, Serv. Verg. A. 11, 850; cf. Aug. Civ. Dei, 18, 15; and Becker, Ant. 4, p. 16.