166 
Beekeeping 
Sight. 
The organs which receive light stimuli are the three simple 
eyes or ocelli (0) and the two large compound eyes (E), all 
situated on the head. The compound eyes are located' on 
the sides of the head, each eye consisting of many units. In 
drones, the number of these units is larger than in the two 
types of females and the compound eyes are so enlarged as to 
meet on the vertex of the head. The structure of the units 
of the compound eye was described some years ago.' On 
' P “ lip «' E ' F " 1905 - Struc ture and development of the compound 
eye of the honey bee. Proc. aead. nat. eci. Phila., LVII, pp. 123-157. 
