Wheeler, in J. Morphol. viii. 1893, p. 81.
Syst. Nat. Ed. 12, ref. i. pars ii. p. 536 (by error, 356).
It must not be supposed that all wingless Insects fall within the limits of this Order.
American Naturalist, xx. 1886, p. 808.
"Syst. Zool. Studien." S.B. Ak. Wien, xci. 1885, Abth. I. p. 374.