vi THE HUMBLE-BEE 
An article entitled ‘ 4omdz in Captivity and 
Habits of Pszthyrus” that appeared in the Axdzomo- 
logists Monthly Magazine for October 1899, con- 
tained my original division of the species of Bomdbus 
into pollen-storers and pocket-makers, and gave 
accounts of the self-parasitism of certain species, and 
of the parasitism of B. terrestris upon LB. lucorum. 
Among matter now published for the first time 
are particulars of the Sladen wooden cover for 
artificial nests, and details of my humble-bee house. 
By the employment of the covers anybody may 
attract humble-bees to nest in his garden, and by 
obtaining a little wooden house and furnishing it 
as directed, one may study at leisure and in comfort 
all the details of their interesting and intelligent 
ways. 
The study of humble-bees has hitherto been 
hampered by the difficulty, encountered even by 
experienced entomologists, in separating some of 
the species. It is hoped that the colour-photographs, 
used in conjunction with the descriptions given, 
will now remove this difficulty. 
My thanks are due to Messrs. L. S. Crawshaw, 
J. W. Cunningham, Geo. Ellison, P. E. Freke, 
A, “H.. Elanim,. W. H,. (Harwood, Rev. Wyte 
Johnson, Rev, EF. BD. (Morice, Messrs» Ey 2B: 
Nevinson, H. L. Orr, and Rupert Stenton for | 
information kindly supplied about the distribution 
