IO T1ON 7 ' OGY. 







. and laterad by tli 

 tin- remainir, . 



of the dorsal portion of the epicranium . 

 :'roin between tin- eyes to the occipu: 

 mai>y writers the term vertex is used in a \ 

 manner to indicate the summit of the : 

 The 'he lateral p 



of the epicranium, those parts which are usually 



f the eyes and caudad of the mandibles. In many insects a distinct 

 suture extends cephalad from each compound eye, separating the front from 

 'nae. 



frit. The occiput (l) is that part of the dorsal wall of tin- head 

 which is articulated with the cephalic margin of the thorax (Fig. iSj. In many 



1 5. Dorsal aspect of head of Ifarfalus. FIG. 19. Ventral aspect of head of Harpalus. 



ts it is a distinct sclerite ; in others it is not distinguishable from the epi- 

 cranium. 



- 'lypt-us. The clypeus (5) is the cephalic part of the dorsal pun 

 the fixed parts of the head. It is bounded caudad by the epicranium. and 

 .rhment cephalad to one of the movable parts of the head, the labrum 

 or upper lip. The clypeus is typically composed of two sclerites. When ' 

 are distinct they are designated as the </;//,--, -lypcus and post-clypeus respectively. 

 The Ctiilti. The gnla IM) is the only one of the fixed parts of the head that 

 is confined to the ventral aspect < Fig. 19). It is bounded laterad by the lateral 

 parts of the epicranium and occiput ; and extends caudad to the caudal border 

 of the head. Cephalad it gives attachment to cjiie of the movable parts of the 

 head, the labium or lower lip. 



The Movable Parts of the Head. 



Under this category arc classed a pair of jointed append 

 termed the ante time ^\\\\\ the organs known collectively as the inout It- 

 parts. 



The Ant en me. 



antenmc ( ~) are a pair of jointed appendage's, inserted in the 



1 in front of th or between them. They vary in form. 



they are thread-like, consisting of a series of similar 



in others certain segments arc- greatly modified in form. 



In the 1 :ius Colfops the antenn.e bear a curious articu- 



i rising from near the base of the third S 



* Horn, Trans. Am. Ent. Sex:., III. p. 79, with figure-. 



