31) is
longer and slenderer, being quite different from the rather broad and
flattened larva of Andrena. The body is rather thick behind, but in
front tapers slowly towards the head, which is of moderate size. Its
body is somewhat tuberculated, the tubercle aiding the grub in moving
about its cell. Its length is nearly one-half (.40) of an inch. On the
pupa are four quite distinct conical tubercles forming a transverse line
just in front of the ocelli; and there are also two larger, longer
tubercles, on the outer side of each of which, an ocellus is situated.
Figure 30 represents the pupa seen from beneath.

Search was made on July 16th, where the ground was hard as stone for six
inches in depth, below which the soil was soft and fine, and over twenty
cells were dug out. "The upper cells contained nearly mature pupae, and
the lower ones, larvae of various sizes, the smallest being hardly
distinguishable by the naked eye. Each of these small larvae was in a
cell by itself, and situated upon a lump of pollen, which was the size
and shape of a pea, and was found to lessen in size as the larva grew
larger. These young were probably the offspring of several females, as
four mature bees were found in the hole." The larva of an English
species hatches in ten days after the eggs are laid.

Another brood of bees appeared the middle of September, as on the ninth
of that month (1864) Mr. Emerton found several holes of the same species
of bee, made in a hard gravel road near the turnpike. When opened, they
were found to contain several bees with their young. September 2nd, of
this year, the same kind of bee was found in holes, and just ready to
leave the cell. It is probable that these bees winter over.

We have incidentally noticed the presence in the nests of Andrena and
Halictus of a stranger bee, clad in gay, fantastic hues, which lives a
parasitic life on its hosts. This parasitism does not go far enough to
cause the death of the host, since we find the young of the parasitic
Cuckoo bee, in cells containing the young of the former.

Mr. F. Smith, in his "Catalogue of British Bees," says of this genus:
"No one appears to know anything beyond the mere fact of their entering
the burrows of Andrenidae and Apidae, except that they are found in the
cells of the working bees in their perfect condition: it is most
probable that they deposit their eggs on the provision laid up by the
working bee, that they close up the cell, and th