Female intersexualism begins with animals which show feathered antennæ of medium size (feathered antennæ are a male character), but which are otherwise entirely female in appearance except that they produce a smaller number of eggs which are fertilized normally. In the next stage patches of the brown male pigment appear on the white female wings in steadily increasing quantity. The instincts are still female, the males are attracted and copulate. But the characteristic egg sponge laid by the animal contains nothing but anal hairs in spite of the fact that the abdomen is filled with ripe eggs. In the next stage whole sections of the wings show male colouration, with cuneiform female sectors between, the abdomen becomes smaller, contains fewer ripe eggs, the instincts are only slightly female, the males are attracted very little, and reproduction is impossible. In the next stage the male pigment covers practically the whole wing, the abdomen is almost male, but still contains ovaries with a few ripe eggs, the instincts are intermediate between male and female. Then follow very male-like animals which still show in different organs their female origin and have rudimentary ovaries.... The end of the series is formed by males, which show in some minor characters, such as the shape of wings, still some traces of their female origin. The series of the male intersexes starts with males showing a few white female spots on their wings. These become larger and larger, the amount of brown pigment correspondingly decreasing.... Hand in hand with this the abdomen increases in size, reaching in the most extreme cases two-thirds of the female size (without containing eggs). The same is true for the instincts which become more and more female. (And also for the copulatory organs which also become more and more female.) As stated above, the main fact that every desired degree of intersexualism can be produced at will by properly combining the races for breeding, and the intersexual potencies of the different races has been worked out by Goldschmidt.[195] [195] Goldschmidt, R., _Proc. Nat. Acad. Sc._, 1916, ii., 53; _Ztschr. induct. Abstammungslehre_, 1912, vii., and 1914, xi.