160 ANIMAL LIFE 
She then waits in an upper cell of the nest until the young 
bees issue from their cells, when she leads them off, and 
each begins active life on its own account. The mining- 
Fie. 94.—Nest of carpenter-bee, Fie. 95.—Nest of Andrena. the mining-bee. 
bees (Andrena), which make little burrows (Fig. 95) in a 
clay bank, live in large colonies—that is, they make their 
nest burrows close together in the same clay bank, but each 
female makes her own burrow, lays her own eggs in it, fur- 
nishes it with food—a kind of paste of nectar and pollen— 
and takes no further care of her young. Nor has she at 
any time any special interest in her neighbors. But with 
the smaller mining-bees, belonging to the genus Halictus, 
several females unite in making a common burrow, after 
which each female makes side passages of her own, extend- 
