(b.) Front. — That part of the epicranium which is upon 

 the cephalic aspect of the head is termed the front. 



(c.) Genes. — The lateral parts of the epicranium are 

 known as th.e gencr or cheeks.* 



Clypeus. — Examine again the ventral border of that part 

 of the epicranium which is upon the cephalic aspect of the 

 head. Note that the prominent suture bounding this part 

 separates it from a very broad, but short sclerite. This is 

 the clypeus. 



Although in a locust the clypeus appears like the basal 

 segment of an appendage of the head; from its form and 

 position in other insects it is classed with the fixed part of 

 the head. 



Make a drawing of the cephalic aspect of the head'; and 

 name the fixed parts. 



Occiput. — -Examine again the narrow ridge which sepa- 

 rates the lateral from the caudal aspect of the head, and 

 forms the caudal border of the epicranium. Note that it 

 may be easily traced on each side through the broad black 

 stripe which extends caudad from the eye ; and that dorsad 

 of that stripe it is obsolete. On each side of the head from 

 a point on this ridge a short distance ventrad of the black 

 stripe a suture extends across the caudal aspect of tlie head 

 to the membrane connecting the head with the thorax. 

 This suture constitutes the ventral border of the sclerite 

 which forms the caudal part of the dorsal portion of the 

 fixed parts of the head. This sclerite is the occiput. As 

 already indicated, the suture between the occiput and the 

 epicranium is well marked on the lateral aspects of the head ; 

 but on the dorsal aspect it is obsolete. Hence on this aspect 

 there is no indication of the line where the occiput ends and 

 the epicranium begins, f 



*If the student finds it difficult to trace the sutures described here, he should boil 

 the head of the locust in a solution of caustic potash. This will destroy the soft 

 parts and bleach the walls of the head so that the sutures may be easily traced. 



fThere is upon each gena a depressed line which appears like a suture but is not 

 one. 



