CLASSIFILUATION OF INSECTS. 365 
pollen in some subterranean mouse-nest or in a stump, and 
the young hatching, gradually eat the pollen, and when it 
is exhausted and they are fully fed, they spin an oval cylin- 
drical cocoon ; the first brood are workers, the second males 
and females. The partly hexagonal cells of the stingless 
bees of the tropics (Melipona) are built by the bees, while 
the hexagonal cells of the honey-bee are made by the bees 
from wax secreted by minute subcutaneous glands in the 
abdomen. Though the cells are hexagonal, they are not 
built with mathematical exactitude, the sides not always 
being of the same length and thickness. 
The cells made for the young or larval drones are larger 
than those of the workers, and the single queen cell is large 
and irregularly slipper-shaped. Drone eggs are supposed by 
Dzierzon and Siebold not to be fertilized, and that the queen 
bee is the only animal which can produce either sex at will. 
Certain worker-eggs have been known to transform into 
queen bees. Worker-bees have been known to deposit drone 
eggs. The maximum longevity of a worker is eight months, 
while some queens have been known to live five years. The 
latter will often, under favofable circumstances, lay from 
2000 to 3000 eggs a day. The queen lays the greatest num- 
ber of eggs in the summer just before the honey season. 
She begins to lay in the center of the cluster of the comb. 
Cuass VI.—INSECTA. 
A distinet head, thorax, and abdomen, three pairs of legs; breathing 
by trachea, usually two pairs of wings; usually with a metamorphosis, 
which ts either incomplete or complete. 
Serres I. Ametabola, or with an incomplete metamorphosis. 
Order 1. Thysanura.—Wingless, minute, with a spring; or ab- 
domen ending in a pair of caudal stylets; usually no 
compound eyes; no metamorphosis (Podura, Campodea, 
Lepisma). 
Order 2. Dermaptera.—Body flat; the abdomen ending in a 
forceps; fore-wings small, elytra-like; hind-wings ‘ample, 
folded under the first pair (Forficula). 
