Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 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.—Betwe
Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 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.
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