Plate G1 



Contact pictures ; exposure 12 days 



FiGUKE 1. Argynnis cybele, female, fresh specimen, upper surface (compare 

 pi. 15, fig. 1) ; the irregular triangle shows the effect of a sheet 

 of quartz 0.2 mm. thick placed between the wings and the plate. 



2. Argynnis cybele, right wings of the same specimen, upper surface; 



the dark circle cutting both wings shows the effect of a thin cover 

 glass placed between the wings and the plate, and the dim band 

 running diagonally across the fore wings is caused by a strip of 

 cellophane placed between the wing and the plate. 



3. Argynnis idalia, female, fresh specimen, upper surface (compare pi. 



13, fig. 1) ; the circular excision in the hind wing shows the effect 

 of a thin cover glass inserted between the wing and the plate ; 

 the dim band crossing both wings shows the effect of a strip of 

 cellophane ; and the short irregular band cutting both whigs above 

 the cover glass shows the eft'ect of a piece of quartz ground to 

 a thickness of 0.2 mm. 



4. Argynnis idalia, right wings of the same specimen, upper side ; the 



broad dim band shows the effect of a strip of cellophane. 

 818 



