202 



DIVERSITY OF THE SEXES 



or of other odd shapes [Figs. 169, 170]. As a 

 general rule these androconia are present in the 

 patches to which we have alluded as forming one 

 phase of the antigenic characters of the male ; but 

 more often, as in the blues and whites, they are 

 scattered indiscriminately, or in rows, over the 

 upper surface of the wings ; and there are many 

 patches, like those at the base of the hind wings 



of some yellows and next 

 the median vein in our 

 Milk-weed butterfly, where 

 androconia are not found ; 

 they do, however, some- 

 times occur in patches on 

 the hind wings, as in the 

 fold next the inner margin 

 of the swallow-tails ; but, 

 with the exception of the 

 discal spot of the hair- 

 streaks, they seem to be 

 present in all patches 

 found on the front wings, occasionally forming the 

 principal part of such patches, as in many yel- 

 lows, and again taking no part in the display. 

 Take, for example, the fritillaries, where so many 

 small black scales are crowded against certain 

 veins as to give them a thickened appearance [see 

 Fig. 162] ; the androconia are also present in great 

 numbers, but entirely concealed ; only by remov- 



FIG. 169. Scales of Limochores 

 Taumas, X 285 ; a, spoon-shaped 

 androconium ; 6, large thin andro- 

 conium ; c, ordinary scale. 



