ami the Gonapophyses in the Dermaptera. 266 



junction is a little longer, or shorter, respectively, than 

 the basal plate, and as broad, the margin gently sinuate 

 with rounded angles. 



Fig. 14. 



-Anechura bipunctata, 

 Fabr., <J . 



Fig. 15. — Mesochdidura 

 holivari, Borm., $ . 



In the former, there are chitinised knobs at the angles 

 at the junction. 



In Forficula auricularia, I have both sexes to offer. In 

 both the basal plate is longer than broad, and slightly 

 constricted, and the angles somewhat prominent : that of 

 the male shows a different pattern from that of the female. 

 The apical plate is more convex : in both the sides are 

 irregular, and there are traces of a transverse suture, 



^>X/^ 



Fig. 16. — Forficula auricularia, L. 



certainly suggestive of a fusion of two plates, more marked 

 in the more primitive female than in the more specialised 

 male : in both the posterior margin is weakly chitinised, 

 with a few bristles. 



