414 



MERISTIC VARIATION. 



[PART i. 



A- is ii-ual with appendages the whole length of the antenrue 

 diffnvd a good <1< -al imlfpnidmtly of the number of joints. 

 621. On comparing antmn:L' with different numbers it seemed that 

 tli.- pi-oporiional length of the first two joints was nearly the 

 same in all, but in the third joint there was great difference, as 

 shu\vn in Fig. 124. The left antenna in Fig. 124, I may be 

 taken to be the normal form with 14 joints. In it both 3rd and 

 1-th joints an- small. The right antenna of the same specimen 

 has 'l 3 joints and in most of the 13-jointed antenna 1 the arrange- 



18 



w 



Fin. 124. Various forms of antenna; of adult Earwigs (Forficula auricularia), 

 all from one garden and taken at one time. 



I. Specimen having the left antenna normally 14-jointed, and the right 

 13-jointed. No. (VJ1. 



II. I'.nlh antennae 13-joiuted. No. 622. 



III. Both antenna' 1'2-joinU'd. No. I'rJii. 



IV. Eight antenna normally 14-jointed ; left antenna 12-joiuted. No. 624. 

 Note that the rights and lefts are arranged as marked by letters r and /. The 



antenna; were so fixed for drawing in order to bring them side by side after the 

 bend from the first joint. This figure was drawn with the camera lucida by 

 Mr Edwin Wilson. 



ment was much as shewn in this figure. As shewn, the 3rd joint 

 especially is hen- ratlin- longer than in the 14-jointed form, but 

 srvn-al of the peripheral joints are also a little longer, so that 



