256 



ELEMENTARY STUDIES 



INSECT LIFE 



hand, cut off one of the eyes, wash well in water, and 

 place the head covering under the microscope, using a 

 low-power lens, Note the hexagonal divisions of the eye. 



Each of these divisions con- 

 stitutes the cornea for a sim- 

 ple eye. There being many 

 of these in each of the eyes 

 as seen externally, it is emi- 

 nently proper to call them 

 compound eyes. Each of the 

 simple eyes of which they are 

 composed is termed ocellus 

 (plural, ocelli). 



Simple Eyes. Between the 

 compound eyes in the front 

 part oi the face are located 

 three bright, shining spots. 

 One can be found immedi- 

 ately in front of the upper 

 half of each compound eye, 

 and one between the antennal 



sockets. These are the simple eyes. (Fig. 193, l>, 1), l>.} 

 Epicranium. The epicranium is that part of the cra- 

 nial box which surrounds and holds the compound eyes 

 and the simple eyes, and extends down the face to a dis- 

 tinctly marked transverse line. The epicranium is di- 

 vided into three parts. 



Front. - The front is that part which is on the cephalic 

 aspect of the head. 



Gense. -The lateral portions of the epicranium are 

 called the gense, or cheeks. 



FIG. 193. Front view of head 

 with clypeus and labrum removed 

 to show mandibles in position, a, 

 antenna ; 6, ocelli ; B, compound 

 eye ; C, mandible ; d, maxilla ; e, 

 maxillary palpus ; /, labium ; g, la- 

 bial palpus. Enlarged about five 

 times. 



