352 Mr. R.M‘Lachlan on new Genera and Species of Psocide. 
I have examined one specimen gummed on card, and in bad 
condition. It is probable that this species may frequent houses 
and warehouses. I once saw a similar species in myriads in the 
empty hold of a ship that had just discharged a cargo of tea from 
China, but the specimens are unfortunately lost. 
Postscript.—Since the introductory remarks to this paper were 
written, Dr. Hagen has published in the Verhand. zool.-botan. 
Gesellschaft in Wien, 1866, p. 203, (“ Psocinorum synopsis syno- 
nymica’’), a plan for dividing the old genus Psocus into several 
separate genera, which greatly facilitates a knowledge of the 
family. It is based upon the number of tarsal joints, and the 
neuration. ‘The genera proposed are Myopsocus, Elipsocus, 
Psocus (proper), Cecilius (Curtis), Lpipsocus, Polypsocus, Peri- 
psocus, Stenopsocus, Calopsocus, and Dypsocus. According to this 
arrangement, the species above described as Psocus grisezpennis 
and P. fraternus belong to Myopsocus; P. femoratus, P. gri- 
sescens, P. infectus, P. reponens and P. cosmopterus to Psocus 
(proper); P. striatifrons to Stenopsocus; and P. imbecillus to 
Cecilius. P. pallipes appears to be the only described species 
which, with the neuration of Stenopsocus, possesses tri-articulate 
tarsi; for it I propose the generic name Propsocus. 
