P. ent. Soc. Washington, ii. 1892, p. 305.
Acta Ac. German. li. 1887, p. 238.
Ann. Soc. ent. France, 1887, pp. 384-404, Pl. 7.
Isis, 1845, p. 835.
For anatomy of caterpillars refer to Lyonnet's famous work, Traité anatomique de la chenille qui ronge le bois de saule, La Haye, 1762.