220 Treubia Vol. Ill, 2. 



Subfam. NYCTOBORINAE: all genera, viz. Nyctibora; Eunyctibora; 

 Paratropes ; heminyctibora; Megaloblatta ; 



Subfam. EPILAMPRINAE: Epilampra; Pinaconota; Notolampra; 

 Eustegasta; 



Subfam. PANCHLORINAE: Paranaiiphoeta; Zetobora; Qyna; Pro- 

 nauphoeta ; 



Subfam. BLABERINAE: Blabera; 



Subfam. CORYDINAE: Polyphaga; Cardax; 



Subfam. OXYHALOINAE: Paraplecta; Anareolaria ; 



Subfam. PERISPHAERINAE: Psendoglomeris ; Cyrtotria; Karnyia. 



Since the subgenital lamina of the c^ is so commonly asymmetrical, 

 we naturally expect this to be the case with the styles too. Brunner ') 

 merely says that an abortion of the right style is very frequent {PJiyllo- 

 dromia^ Temnopteryx etc.), and that a notch takes the place of the style 

 which has been suppressed. But to give a few additional particulars: the 

 suppression may be entire or partial. In Theganopteryx lucida, BRUNNER, 

 Ischnoptera basalts, Gerst., Anacompsa cucullata, Shelf., Paraplecta 

 aethioplca, SHELF., the left style is well developed, whilst the right has 

 disappeared altogether. In other cases the left style is merely stouter than 

 the right, as in Theganopteryx gambiensis, SHELF., T. notata, SHELF., 

 Hemitliyrsocera massuaej S. &■ Z., //. circumcincta, R. & F., Pseiidothyr- 

 socera bicolor, Shelf., Phyllodromia pictnratay Suelf., and Piroblatta Alln- 

 audiy Shelf. But there are also instances where the right style is well 

 developed, and the left has disappeared, as in Zetobora lata, Shelf., and 

 Eustegasta variegata, Shelf. Or the right style may be only stouter 

 than the left, as in Ischnoptera blmaculata, Gerst., and Hemitliyrsocera 

 rldleyl, SHELF. 



Such asymmetry, affecting so many different structures in the Blattidae, 

 is surely not approached, much less equalled, in any other Insects. To 

 account for it, one is in the first line, of ocurse, tempted to regard it as 

 the result of the left tegmen crossing the right, with a subsequent stronger 

 development of the former, and a corresponding reductions of the other 

 organs of the left half of the body, as e. g. the smaller number of spines 

 in the left anterior femora of Panesthia, and the fewer tarsal joints in the 

 left feet of so many species. Unfortunately the fact that the right style of 

 the & is more frequently suppressed than the left does not fit in this theory. 

 If we could prove that in those forms where the tegmina are symmetrical, 

 i. e. where they meet in a straight line without crossing each other 

 {Dlploptera, Eiithyrrapha, Aphlebla, Hypnorna), the other organs of the 

 body have remained symmetrical too, such a theory would receive a 

 welcome support. 



') loc. cit. p. 15. 



