60 
THYSANURA. 
A. S. Packard, Jr. — Synopsis of the Thysanura of Essex County, 
Mass., with descriptions of a few extralimital forms. <Fifth An- 
nual Report of the Trustees of the Peabody Academy of Science 
for the year 1872, Salem, 1873, pp. 23-51. 
John Lubbock. — Monograph of the Oollembola and Thysanura. Lon- 
don, Ray Society, 1873. 
The introduction gives the full bibliography up to date. 
Andrew Murray. — Economic Entomology. Aptera. South Kensing- 
ton Museum Science Handbooks, London and New York, 1877. 
The Thysanura are treated of on pp. 401-416. 
