190 
Psyche 
[October- December 
several others. A brief resume of all that is known of the nesting 
habits of the 9 species treated in this paper has been added, in 
order to make these data as complete as possible. The new 
facts which I have recorded in the following paragraphs are 
based on observations of 55 bumblebee colonies which were 
discovered at Berkeley, Calif., Washington, Me., and Boston, 
Mass., during the summers of 1920, 1921, and 1922, and on 
copious field notes. 
The interesting beetles of the genus Antherophagus, and 
also mites of the family Gamasiday occurred in almost every one 
of the 50 nests which I examined, and in one case over 20 of the 
beetles were found; but, to avoid useless repetition, the individual 
cases are not cited below. 
Terrestris Group. 
I. Bremus af finis Cresson. 
Very little is known concerning the nesting habits of this 
bee. Some years ago, Franklin (1912/13, I, p. 280) found a 
nest in southern Vermont during the early part of July. It 
was situated in an open mowing place on the surface of 
the ground, and, since it contained but a few cells with par- 
tially developed larvae, had apparently been started only shortly 
before by the queen. Franklin (p. 280) makes the following 
statement regarding the location of this nest: “ Although this 
was a surface nest, the fact that the queens of this species are 
never seen in abundance, while the workers and males in late 
summer often appear in large numbers, together with the fact 
that their nests are so seldom found, leads me to the opinion 
that they are usually subterranean.” 
The surmise expressed in the forgoing quotation is confirmed 
by my own observations. Of 9 Bremus a finis nests discovered 
in the Arnold Arboretum (within the city limits of Boston) 
during the summers of 1921 and 1922, every one was subterranean. 
They were situated from 1 to 4 ft. below the surface of the ground 
and had tunnels varying from 18 inches to 8 ft. in length. The 
