HERMANN HAGEN.--Synopsis of the Neuroptera of North America, with a list
of the South American species. Smithsonian Miscellaneous Collections,
Washington, 1861.
---- Synopsis of the Odonata of America. <Proc. Boston Soc. Nat. Hist.,
Vol. XVIII, 1875, pp. 20-96.
SIR JOHN LUBBOCK.--Monograph of the Collembola and Thysanura. London,
Ray Society, 1873.
The introduction gives the full bibliography up to date.