Bull. Soc. Ent. France (5) vii. 1877, p. lxix.; also André, Feuille Natural. vii. 1877, p. 136, and Riley and Howard, Insect Life, iv. 1892, p. 242.
Insect Life, i. 1888, p. 121.
Report of the Entomologist, Dep. Agriculture, Washington, 1886, p. 542.
Wachtl, Wien. ent. Zeit. xii. 1893, p. 24, and Howard, P.U.S. Nat. Mus. xiv. 1892, p. 586.
Abh. Ges. Göttingen, xxviii. 1882.