SMELLING, HEARING, ETC, 
91 
antennae most sensitive touch organs. They are 
mostly found on the front side. Besides these there 
are conoid hairs (Tastkegel — b, a), which are situated 
nearly at the end of each joint. They are hollow and 
have a nerve fibre (e, Schiemenz considering them 
modified bristles which act as feelers, more especially 
as they are found in greatest abundance at the ex- 
tremities of the antennae. 
Between the tactile hairs in the antennae of the 
worker are found cavities covered by a thin layer, 
which on the outside surface show consecutive oval 
rings. Fig. 38, f, shows an enlarged section of one of 
these hollows, and the appearance of rings is produced 
by the difference in thickness of the layer of chitine. 
When looking down upon these depressions they have 
the appearance of G. These hollows are placed at an 
angle, and into the cavity below {c, f), passes a nerve 
end cell. These Schiemenz considers smell hollows, 
and he finds little difference in their numbers in a 
worker and queen, but says between these and the 
drone there is a great difference. Whereas in the 
queen and worker they are larger and further aj>art, 
with tactile hairs situated between them, those in the 
drone are crowded so closely together that there re- 
mains hardly any room for the feeling hairs, which are 
in consequence only found singly here and there, 
and only appear in greater numbers on the terminal 
joint. They are besides much smaller, so that the 
surface covered by them contains a very much larger 
number. Schiemenz says this is as might be ex- 
pected, if these are considered as organs of smell, for 
