BRITISH HIVE-BEE. 335 
fusion of parts. The supra-cesophageal ganglia are very 
large, and send large lateral extensions to the compound 
eyes. This “brain” is best developed in the active 
workers. The sub-cesophageal mass is formed by the 
fusion of three pairs of ganglia. In the thorax there are 
two pairs of ganglia, of which the second supplies the wings 
and the two last pairs of legs. In the worker there are five 
Fic. 179.—Nervous system of bee.—After Cheshire. 
A, of larva, B, ofadult. a, Antenna; wx., maxilla; 7., mandible ; 
w., origin of wing ; 1-5, abdominal ganglia. 
pairs of abdominal ganglia, but in the queen and drone 
only four. The sense organs are the simple and compound 
eyes, and the antenne, which are furnished with numerous 
sensitive structures. 
Alimentary system.—The csophagus is a narrow tube 
which runs down the thoracic region. In the abdominal 
region it expands into the crop or honey-sac. The crop 
opens by a complicated orifice, with a remarkable stopper 
