103 
is found a calcareus ring, serving the purpose of keeping the honey 
quiet during the first movements of the larva, so that its spiracula 
may not be cloyged with honey and the larva thus die from suffo- 
cation"). The calcareus substance is secreted from the large gland 
situated in the abdomen under the intestinal canal. 
Podalirius furcatus Pz. The mnests are found in branches 
blown down from trees and also in wooden posts. They nearly 
always consist of two, three or four parallel burrows down through 
the wood. The cells are enlarged parts of the burrow. At the 
bottom the jug is made of wood dust, which the bee takes from 
fhe part immediately above, thus widening the burrow here to make 
room for another cell. The bee has, therefore, always two cells in 
hand, one in which the jug is being built of the material excavated 
from the other next above it. 
The last jug is built of material which the bee takes from 
the sides of the burrow, just inside the entrance, and this explains 
the considerable widening, which is always found there. 
Podalirius vulpinus Panz. builds its nests in clay walls. The 
burrow is closed by a disc of clay !/2 Centimetre from the entrance. 
Eucera longicornis L. digs a burrow into the earth, from 
which lateral burrows issue, one cell being made in each of these. 
Two females have been found building one nest. 
Megachile lagopoda L. builds its nests in the burrows of the 
 Dorcus-larva and formes its cells of pieces of beech-leaves. 
BE rn en REE ARE ERL MAE 
1) This has been first shown in the case of Podalirius parietinus by 
Dr. Wesenberg-Lund. 
