Lewis & Short

1. cŭlex, ĭcis, m. (f., Plaut. Cas. 2, 3, 22), a gnat, midge (comprising very many species), Plin. 11, 2, 1, § 2 sq.; 11, 35, 41, § 118; 17, 27, 44, § 255; Plaut. Curc. 4, 2, 14; Lucr. 3, 391; Hor. S. 1, 5, 14; Col. 11, 3, 60; Mart. 3, 93, 9 al.
Also the title of a writing of Verg.; cf. Heyn. Verg. tom. iv. prooem.
As a term of reproach for a wanton lover, Plaut. Cas. 2, 3, 22.