94> 
Psyche 
[September 
March to September, at which time the number was apparently 
closed and sent to the printer. The printing of the issue consumed 
three months. In consequence, the cover bears the date of publica- 
tion, January 10, 1950. 
This being the case, the genus Kyidris Brown takes precedence 
over the synonymic genus Polyhomoa Azuma. As to whether Az- 
uma’s species itoi is a synonym of Brown’s mutica is not certain 
but it seems probable that this is the case. 
Massachusetts Records of Cyphoderus assimilis Borner (Col- 
lembola). — During the last three years, specimens of this species 
have been recovered in the field from ant nests in four localities in 
Massachusetts. The species has been taken from Annisquam in 
May, June, and July, from Boston in September, from Swampscott 
in September, and from Cambridge in October. In the New World 
this species is ordinarily found in tropical and subtropical areas, 
and when taken in more northerly regions it is usually in such art- 
ificially sheltered areas as greenhouses. Its occurrence in Massa- 
chusetts may be only a local invasion, but that this has been 
successful to some extent is shown by the recovery of specimens in 
one area (Annisquam) in three successive years. Although the 
species has not been found outside of ant nests, it shows little se- 
lectivity as to the ant, having been found in nests of Aphaenogaster, 
Acanthomyops, Chthonolasius, Lasius, and Tetramorium.-— K. A. 
Christiansen, Biological Laboratories, Harvard University. 
