344 Dr. E. A. Cockayne on an Intersex of Amorpha populi. 



Goldschmidt in crossing European Lymantria dispar with 

 its large Japanese race, var. japonica, obtained individuals 

 in some broods which were only distinguishable from males 

 by possessing small flecks of light colour, like that of the 

 female, equally distributed over all four wings. These he 

 called first " Weibchenmannchen " and later " Intersexes." 

 Internally some had normally shaped testes, but others had 

 lobulated testes without any yellow pigment in the capsule. 

 He gives a figure on p. 296 of his paper, which can be com- 

 pared with mine. 



Most of those with normally shaped testes had sperma- 

 tozoa and spermatocytes only, but in some of the lobulated 

 testes there were in addition small or large numbers of 

 oocytes and ova. 



The external genitalia of Goldschmidt's specimens were 

 male in character, but with some modification of shape. 

 The penis, uncus, saccus and valves were shorter and 

 broader than normal. In addition to the " Weibchen- 

 mannchen," numbers of moths were bred which showed a 

 more striking mixture of male and female characters, and 

 in his earlier papers Goldschmidt called these male and 

 female gynandromorphs ; but wishing to distinguish them 

 from ordinary halved gynandromorphs, which must arise 

 from a different cause, he has grouped all of them under the 

 name " Intersex." 



The resemblance between this specimen of A. populi 

 and these Lymantrias is so close in most respects that I am 

 inclined to think it must be of the same nature. Like the 

 Lymantrias it arose from crossing various races of British 

 populi for several generations. 



Bibliography. 



Goldschmidt and Poppelbaum. Zeitschr. f. Indukt. 



Abstamm. u. Vererbungslehre, 1914, xi, p. 296. 

 Goldschmidt. National Academy of Sciences, Washington, 

 D.C. Proceedings, No. 1, vol. ii, p. 53. 



