and the Gonapophyses in the Dermaptera. 261 



dilated, with a semicircular convex margin : beyond this 

 is quite discernible a broad, transverse, very feebly chitin- 

 ised plate, with some bristles, which is the telson, already 

 becoming weaker. In adult males the telson is even more 



Fig. 6.- 



-Allosiethus indicum, 

 Hag., 9. 



Fig. 7. — Allostethus indicum. 

 Hag., S Nymph. 



membranous, with no defined edges, and the metapygidium 

 nearly parallel-sided, with a pair of broad, pointed lobes 

 at the angles, and a concave posterior margin. AsZacher 

 points out, the female retains the more primitive form of 

 opisthomeres, as she does of the forceps. 



In the male of Gonolabidura astruci we find a very similar 

 structure. The lobes on the metapygidium recall those 



Fig. 8. — Gonolabidura astruci. Burr, S . 



of the telson in Pygidicrana, which is perhaps Zacher's 

 reason for identifying this plate as a fused telson and 

 metapygidium. 



In the Psalidae we find indications that the basal plate 

 consists of the metapygidium fused with the pygidium : 

 the following are my reasons : — 



