JOUENAIj 



OF THE 



IIOYAL MICROSCOPICAL SOCIETY. 



FEBEUARY, 1916. 



TRANSACTIONS OF THE SOCIETY. 



I. — On the Male Genitcd Armature of the Dermaptera. 

 Part III. : Eudermaptera. 



By Malcolm Burk, M.A. D.Sc. F.L.S. F.E.S. 



Communicated by John Hopkinson, V.-P. R.M.S. {Bead May 19, 1915.) 



Plates I to IV. 



EUDERMAPTEPtA. 



This is the higher section of the Bermaptera proper. Here we 

 find a more compact body, reduced opisthomeres, and a single 

 penis, which last feature sharply differentiates it from the more 

 primitive Protodermaptera. 



We find a greater variety of external structure, but greater 

 uniformity in the genitalia. At the same time, the subdivisions 

 are far less sharply marked, and for distinguishing features we are 

 driven more and more to purely sexual characters, the form and 

 armature of the forceps, the spines of the abdomen, and keels of 

 the elytra for our characters. The number of genera containing 

 few species becomes multiplied, but yet we are confronted with a 

 much more uniform structure of tlie male genitalia than in the 



EXPLANATION OF PLATE I. 



FIG. 



1. Nesogaster ruficeps Erichs. 



2. Irdex nitidipennis Borm. 



3. Marava doddi Burr. 



4. Ditto. 



5. Spongovostox ruber Bor. 



6. S. conradti Burr. 



7. Ghxtospania pittarellii Bor. 



Feh. 16th. 19 IG 



PIG. 



8. Chittosjjania stiletta Burr. 



9. Homotages fene Borm. 



10. Spongovostox quadrimaculatus Stftl. 



11. S. assinicnsis Borm. 



12. Ditto. 



1.3. S. tripunctatus Bor. 



14. S. schlaferi Burr. 



