200 



DIVERSITY OF THE SEXES 



which their absence is extremely rare. In the 

 highest butterflies they are long, slender, and 

 invariably feathered at the 

 tip [Pig. 164]. In one small 

 group they are toothed as 



a "b 



FIG. 165 Scales of Pieris 

 rapae ; a, androconium ; &, 

 ordinary scale ; x 285. 



FIG. 166. Scales of Leptotes 

 Theonus ; a, androconium ; 

 6, ordinary scale ; X 785. 



well as feathered. With the exception of this 

 small group they may be dis- 

 tinguished from ordinary scales 

 by the absence of any dentation 

 at the tip. In the whites they 

 are fringed [Fig. 165], and with 

 a single known exception their 

 extreme base is expanded into 

 a sort of bulb ; elsewhere, even 

 in the other groups of the 

 family to which the whites 



.belong, they are not fringed, 

 but have a smooth rounded 

 edge. In the blues they assume 

 a battledore or fan-shape, with a smooth edge, 



FIG. 167.-Scales of Bre- 

 phidium Pea ; a, androco- 

 nium ; b, ordinary scale ; 

 X 785. 



