18 
BULLETIN 1222, U. S. DEPARTMENT OF AGRICULTURE. 
their food surrounding them, but a small amount of honey 
(nectar) mixed with pollen may be found on the base of the 
cell and adhering to the larva. 
Full-grown larvae (fig. 11) — that is, 
larva? in cells more than half covered 
by the cap — fill the lower half of the 
cell so completely that the form of the 
larva suffers considerable distortion. 
The body is flattened and the head 
and tenth trunk segments are crowded 
back, telescoped into the neighboring 
segments, and, as the figure shows, 
are invisible from the mouth of the 
cell. Larvae of this age, fixed and 
hardened in the cell, as was the one 
from which the figure was drawn, 
form veritable casts of the interior 
of the lower half of the cell. It 
should be noted that 'the head is 
always nearer the mouth of the cell 
than is the posterior end, the long axis of the larva thus following a 
spiral course. 
SUMMARY AND CONCLUSIONS. 
Pig. 
10. — Larva of bonevbee. 4 davs 
old. 
Eggs of the honeybee at the commencement of development weigh 
about 0.132 milligram each. 
At the close of embryonic de- 
velopment they weigh from 
0.08 to 0.1 milligram each. 
Larval development, up 
to the time of sealing, lasts 
4-| to 5^ days. The aver- 
age weights of the larva 
obtained from Lots 1 to 5 
were as follows : First day, 
0.65 milligram; second day, 
4.687 milligrams; third day, 
24.64 milligrams ; fourth 
day, 94.692 milligrams; fifth 
day. 157.642 milligrams. 
Averaging the weights ob- 
tained under various condi- 
tions under Lot 8 the follow- 
ing weights were obtained : 
Second day, 4.745 milli- 
grams; third day. 24.626 
milligrams; fourth day, 
93.99 milligrams; fifth day. 
146.748 milligrams; sixth 
day, 155.005 milligrams; 
seventh day, 141.647 milli- 
grams: eighth day, 137.165 
milligrams; ninth day, 133.152 milligrams. 
day are of sealed brood. 
Fig. 11. — Mature honeybee larva, the half of the 
cell facing the observer being removed so that 
the Larva is shown as s+>en from one side of 
the cell, and not from the outer end, the base 
of the eel] being toward the bottom of the 
page. 
Weights after the fifth 
