me aut . 7 F. i. al 7 % Bie ee 
ACS. PAcKARD, jp a Ss of te Thesanntd of tae ounty, . 
_ Mass., with descriptions of a few extralimital forms. <Fifth An- 4 : 
iy ~ nual Report of the Trustees of the Peabody Academy of Science ~< 
for the year 1872, Salem, 1873, pp. 23-51. -. 
: Joun LuBBOcK.—Monograph ofthe Collembola and Thysanura. Lon- 
qs don, Ray Society, 1873. 
. The introduction gives the full bibliography up to date. 
ANDREW MuRRAY.—Economiec Entomology. Aptera. South Kensing- 
ton Museum Science Handbooks, London and New York, 1877. 
The Thysanura are treated of on pp. 401-416. 
