THE ANATOMY OF INSECTS. 



II 



In descriptive works names have been given to particular parts of the anten- 

 nae, as follows (Fig. 201 : 



.Vtf/V. The first or proximal segment of an antenna is called the scape 

 (</).. The proximal end of this segment is often 

 subglobose, appearing like a distinct segment ; in 

 such cases it is called the bulb. 



The Ptdicel. The pedicel (/>) is the second 

 segment of an antenna. In some insects it differs 

 greatly in form from the other segments. 



The Clavola. The term clavola (c) is applied 

 to that part of the antenna distad of the pedicel ; 

 in other words, to all of the antenna except the 

 In some insects certain parts of the clavola are 

 These are the ring-joints, the 



FIG. 20. Antenna of Chalcis-fly. 



first and second segments. 



specialized and have received particular names. 



funicle. and the club. 



The Ring-joints. In certain insects (e.g., Chalcididae) the proximal segment 

 or segments of the clavola are much shorter than the succeeding segments ; in 

 such cast ve received the name of ring- joints (c 1 ). 



( lub. In many insects the distal segments <>f the antenna- are more or 

 less enlarged. In such cases they are termed the club (c*). 



The Fiinide. The funicle (r} is that part of the clavola between the club 

 and the ring-joints ; or, when the latter are not 

 specialized, between the club and the pedicel. 



The various forms of antennae are designated by 

 special terms. The more common of these forms 

 are represented in Fig. 21. They are as follows: 



or bristle-like, in which the seg- 

 ments are successively smaller and smaller, the 

 an tapering to a point. 



like, in which the seg- 

 ments are of nearly uniform thickness. 



3. Afoni/i/t>rm or necklace-form, in which the 



are more or less globose, suggesting a 

 string of t>' 



4. v-like, in which the segments are 

 and project like the teeth of a saw. 



iii-like. in which the segments 

 have long processes on one side, like the teeth of a 

 comb. 



6. r club-shaped, in which the segments 



become gradually broader, so that the whole < 

 assumes the form of a club. 



with a iiead. in which tin- terminal segment or segments form 

 iob. 



8. /. -cgmentsth.it ..impose the knob are extended 



on one sid< 



Fie. st. Various forms of an- 



trini.T. 



