FOKM AND FUNCTION 



257 



Vertex. - That portion of the epicranium which lies 

 on the top or dorsal aspect of the head is known as the 

 vertex. 



Clypeus. Just helow or ventrad of the front of the 

 epicranium is the transverse suture, pre- 

 viously mentioned, that separates the 

 front of the epicranium from the broad, 

 rather short sclerite. This sclerite is the 

 clypeus. (Fig-. 1.94.) 



' ' , r , V, . ,. , , , . FIG. 194. Clypeus 



Make a drawing ol the cephalic and labrum . En . 

 aspect of tlie head (that part of the lar ^ ed about five 



times. 



head which extends directly forward, 

 and which might be commonly spoken of as the front 

 view of the head), showing and naming all the fixed 

 parts. In making these drawings the greatest care 

 should be given to the accurate delineation and proper 

 proportions of the parts, without any attempt whatever 

 being made at shading 1 . In the majority of cases shad- 

 ing will only tend to mask the details which must neces- 

 sarily be brought out. The accompanying illustrations 

 are given simply as aids, and not with the intention 

 that any attempt whatever shall be made at their repro- 

 duction. The line-drawings will have a very different 

 appearance from shaded illustrations, and will go much 

 farther toward cultivating the powers of observation in 

 the student. 



Movable Parts of the Head. 



Antennae (singular antenna) (Fig. 194, a}. Just 

 between the compound eyes arise the two many-jointed 

 antenme. Make a drawing of these antennae, showing 



the number of joints. 

 17 



