Vol. xxiv] ENTOMOLOGICAL NEWS. 23 



Harmostes reflexulus Say. 



Winnemucca Lake, Nevada, one specimen. 



Alydus setosus Van Duzee. 



'Santa Monica, California, one specimen, apparently first 

 record since the type. 



Anasa ? obliqua Uhl. 



Santa Monica, California, one specimen. 



Brochymena quadripustulata Fabr. 

 One specimen from Brigham, Utah. 



Antigeny in Nearctic Butterflies (LepicL). 

 By HENRY SKINNER, M.D., Sc.D. 



Antigeny has been defined as sexual dimorphism and it 

 has the advantage of expressing the idea in one word. Many 

 of our butterflies show marked differences in appearance be- 

 tween the sexes, of a secondary sexual character, and while 

 there have been many theories to account for these differ- 

 ences, none of them appear to the writer to be very satis- 

 factory or convincing. There is a great difference among the 

 various species as to the degree or amount of antigeny shown. 

 In some cases it is so great that the sexes of one species have 

 not infrequently been described as totally different species 

 and in other cases the differences between the sexes is slight 

 or non-existent. 



Examples of marked antigeny are shown in Arg\nnis diana, 

 Neophasia tcrlooti, Meganostoma eurydice, Pieris amaryllis, 

 Colias christina, Papilio turnus, Pamphila zabulon and hobo- 

 mok and others. If we include the Hesperidae about one sev- 

 enth of the North American butterflies may be said to show 

 antigeny. Whether these have any advantage in the struggle 

 for existence or not, I will not discuss in this article. 



In the large genus Argynnis there are a number of antige- 

 netic species .... diana, idalia, cybele, nokomis, leto, 



