MIMICRY AMONGST THE BLATTID/E. 



365 



simply, the apical triangle. In the genera Eclobius, Thegan- 

 opteryx, and Chorisoneura, to select but three examples from 

 many, the apical triangle is still larger, has clearly defined 

 boundaries, and in the closed wing appears either rolled up in a 



Text-fig. 43. 



Chorisoneura taeniata Sanss. Sl Z. 

 Wing expanded (a) and folded (h). The apical triangle is shaded. 



Text-fig. 41. 



Anaplecta decipiens Sauss. & Z. 



Win- expanded (a) and folded (/,). The apical area i.- shaded. 



spiral (Ectobius and Theganopteryx) or as a doubled fold (Choriso- 

 neura), lying on the top of the anterior part of the wing (text- 

 fig. 43). Between this stage of wing-development and that 



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