82 " Gynaiulfoniorp/iisin, ' (iiiaI Kindred Problems 



genital tract or a part of the external genitalia may be found, but the 

 part which is found may show doubling. 



There is thus no fundamental difference between lateral genetic and 

 many primary somatic hermaphrodites. 



Secondary somatic hermaphrodites are probably quite different, and 

 one point which supports this is that two gonads have been present in 

 all the cases investigated. 



Examples of Secondary Somatic Hermaphrodites of male type appear 

 to be rare. One is figured by Wenke and described by 0. Schultz. It 

 is a Lymantria (Ocneria), externally male in shape and colour, but with 

 streaks of female colour on both forewings. 



The L. dispar similar in external appearance, bred by Schiitze and 

 described later, were probably similar internally also, since two of them 

 proved fertile when paired with normal females. 



The only undoubted examples of female type are the six Agriades 

 coridon dissected by me and described fully in the Entomologist's Record, 

 but all the similar gyuandromorphs from the same locality are probably 

 of the same constitution. The Agriades coridon females streaked with 

 male colour dissected by Dr Chapman and myself, may belong to this 

 group, but their exact nature is still uncertain^ 



Gynandromorphisrii associated with Heterochroism. 



A considerable number of instances are now known in which an 

 insect, in addition to being gynandromorphous, exhibits the colour and 

 pattern of the type form in all the parts which are of one sex, and 

 those of some varietal or aberrational form in all the parts which are of 

 the other sex. 



The dimorphism is not sexual ; for both the type form and the 

 aberrational form occur equally in normal males and females of the 

 species in a majority of these cases. Further than this these strange 



' Since this paper has beeu iu the press Duncan has published an interesting note on 

 the gonads of Drosophila ampelopliila in the American Naturalist, 1915, Vol, XLix. 

 p. 455. Five specimens were dissected one of which was perfectly halved, the others 

 showing some crossing of secondary sexual characters. So far as the examination went 

 all showed halving of the genital armature. The gonads were in three cases male on both 

 sides, in two female on both sides. None had any sexual instinct though four were 

 courted in vain by one or more males. 



The perfectly halved specimen was heterochroio, being red-eyed on the female side and 

 white-eyed (a sex-limited character inherited in the same way as colour-blindness in man) 

 ou the other. Another specimen also showed heterochroism, being red-eyed on one side 

 and cherry-eyed on the other. 



