Male Genital Armature of the Dermaptera. Part II. 545 



■ 2, 2. Elytra reduced to lateral flaps on the sides of the meso- 

 notum : — 



6. E. mcesta Gene. (S. Europe). 



7. E. andreinii Bor. (N.E. Africa). 



8. E. stUi Dohrn. (India). 



9. E.fece Bor. (E. Africa). 



2, 2, 2. Totally apterous (normally) : — 



10. E. annulijjes Luc. (Palrearctic and cosmopolitan). 



11. E. tellinii Bor. (E. Africa). 



12. E. incisa Bor. (W. Africa). 



And perhaps we may add E.pallipes Shir., from Formosa, which 

 very closely resembles E. stall in external characters ; possibly 



Fig. 63. — Eioborellia incisa Bor., S ■ Genitalia. 



also the Neotropical E. nigra Caud., which I am inclined to think 

 was a stray specimen of E. stall. 



The instability of the organs of flight is well illustrated by 

 E. janelrensls, in which we find specimens with almost every 

 degree of development and reduction, and from material* available 

 I think we shall find the same thing' in the West African E. cinctl- 

 collls Gerst. 



It is difficult to express clearly the difference between E. 

 annullpes, E. compressa, and E. tellinii, but once authentic specimens 

 have been compared and the difference in appearance recognized, 

 they can hardly be confused. E. Incisa Bor. can be recognized, as 

 the name implies, by the triangular incision in the apex of the 

 ninth sternite of the male (fig. 63, and PL XII, figs. 13-20). 



