Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† scărăbaeus, i, m., = σκαράβειος σκάραβος), a beetle, scarab, scarabee, Plin. 11, 28, 34, § 97; 30, 11, 30, § 99; Aus. Epigr. 70, 10.