Lewis & Short

cīmex, ĭcis, m. (so always acc. to Neue, Formenl. 1, p. 619 sq.; but fem., Plin. 32, 10, 47 § 136 Sillig and Jan.), a bug, Liv. Andron. ap. Fest. p. 210, 17; Varr. R. R. 1, 2 fin.; Col. 6, 18, 2; Plin. 30, 14, 45, § 131; 29, 4, 17, § 61; Veg. 2, 33, 2; 5, 14, 21; Cat. 23, 2; Petr. 98, 1; Mart. 11, 32 al.
As a term of reproach, * Hor. S. 1, 10, 78.