Male Genital Armature of the Dermaptera. Part II. 527 



nized, either from actual specimens, or from a good figure ; such 

 are A. felix Burr, A. westralica Burr (Western Australia) ; 

 A.littorea White (New Zealand); the very small A. verhazffi, 

 Zacher, from New Guinea; the rather stout little A. hottentotta 

 Dohrn, from South Africa ; the elegant A. Izeta Gerst, from East 

 Africa; the rich claret-coloured and large A. gestri Borelli, from 

 West Africa ; the sturdy A. kudagas Burr, from Ceylon. In most 

 instances, the area of distribution is fairly limited, and this is a 

 great help. 



The shape of the ninth sternite of the male affords some very 

 useful characters, both for classification and for determination. As 

 a rule, it is only the apical portion, or actually the outline of the 

 posterior margin which is described ; properly the sternite should 

 be dissected out, and the shape of the entire plate recorded and 

 illustrated, with the manubrium adhering. The shape of the 

 sternite in several species is illustrated in my paper on the 

 manubrium ; for monographic work it is important that this be 

 done in every species. I am sure that the difficulty of determining 

 species will thus be greatly facilitated ; meanwhile, the following 

 notes will be helpful. Owing to the fluctuating state of the genera, 

 generic names are omitted from this list. 



Grouping according to the form of the 9th Sternite of the Male. 

 Acute — Owenii Burr. 



E MARGIN ATE 



Horvathi Burr. Incisa Bor. 



Verhoejfl Zacher. Marginalis Dohrn. 

 Kudagie Burr. 



Truncate — 



Westralica Burr. Woodwardi Burr. 



Occidentals Kirby. Pacifica Erichs. 



littorea White. Vicina Burr. 



Maritima Bon. JEthiopica Burr. 



Tuinida Bor. Kristenseni Burr. 



Turgida Burr. Gestri Bor. 



Pag ana Burr. Lseta Gerst. 



Queer ens Burr. Compressa Bor. 



Duhronii Kirby. Tcllinii Bor. 



Infelix Burr. Maxima Brullu. 



Rufescens Kirby. Annulipes Luc. 



Vosseleri Burr. Saramaccensis Zacher. 



Braueri Zacher. Brunneri Dohrn. 

 Felix Burr. 



