COLORS AND MARKINGS OF ANIMALS 



283 



or brownish shade. But if the hght from below is cut off 

 by placing a hand over the microscope mirror they will 

 show an iridescent blue or green. 



l'"lG. 220. — Single scales from moths and butterflies; <?, from ToIvpe'''-'i-'llcdn ; 

 /', from Castnia sp.; (', from JMicroptt-ryx ariincella. {Greatly magni- 

 fied; fnjm specimens.) 



Examine under the microscope a bit of wing from which 

 niost of the scales have been rubbed (figs. 221 and 222). 



Fig. 221. — A small, partlv denuded part, much magnified, of a wing of a 

 "blue" butterfly, Lycana sp., sliowing the wing, scales, and the pit,- 

 in the wing-membrane, in which the tiny stems of the scales are in- 

 serted. (Photomicrograph by Geo. O. Mitchell.) 



Note rows of tiny pits or pockets in which the stems of 

 the scales fit. The scales are fastened, though not very 



