Ann. Soc. ent. France (4) x. 1870, p. 330.
See on this difficult subject, Becher, Wien. ent. Zeit. i. 1882, p. 49.
Loudon's Magazine, v. 1832, p. 302; P. ent. Soc. London, 1871, p. x.
Baron von Osten Sacken informs the writer that this statement has since been withdrawn by Portschinsky as being erroneous.
Ent. Amer. iii. 1887, p. 126.