407 



is much smaller than the two preceding ones, the proportional 

 lengths being 30 : 30 : 22 (cf. text-ligs. 20 and 21). The accessory 

 apical segment (podotelson of Vekhoeff), characteristic of all 

 Dermaptera and apparently- only found in this order, is present 

 in both species of Arixenia, as it is in Hcmimcrus. 



Fig. 20. — First maxilla of Arixema esati. 



Fig. 21. — First maxilla of Arixetiia jacobsoui. 



Fig. 22. — Second maxilla of Arixeuia jacobsoui. 

 a» and ii-, the two sclerites of the cardo ; d', d^, d», the three parts of the 

 stipes ; c\ lacinia ; c^, galea ; mp, maxillary palpus ; Ip, labial palpus ; pg. 

 palpiger ; m, mentum ; sm, submcntum : li. lÍRula. 



The second pair of ma.xilhe, the labium and its aj)pcndages 

 (text-fig. 22). has the general facies as in other Dermaptera. It 

 differs in the t\V(; species of Arixeuia. The most proximal 

 sclerite, the submentum (sm), wiiich forms the posterior margin 

 of the head-capsule on the undersurface. is a narrow transverse 

 plate in both species. The mentum (m) is decidedly shorter 



