1914] Whiting—Sitowski’'s New Aberration of Colias Hyale 5E 
are blunt rather than pointed and the striations are parallel to 
the sides rather than oblique as in the type. 
Considerable discussion follows as to the causes which might 
be supposed to produce an aberration of this type. The hypoth- 
esis of Pictet, that one and the same factor may produce different 
changes of color, is adopted. Melanism and albinism are sup- 
posed to be brought about by the same environmental factor 
acting upon different individuals of the species. As evidence 
for this view, it is stated that dark forms and light forms occur 
in the same region, and the aberration polonica displays both 
the melanic and the albinic tendencies in the single individual. 
The author would seem to assume either that temperature, 
humidity and light must be constant in any given region or that 
the life histories of the various members of any species must be 
so adjusted that they are subject to exactly the same conditions 
at the same periods of development. It is also not at all clear 
why the breeding experiments with Colias should have been 
entirely overlooked. Harrison, Main and Frohawk have clearly 
shown that albinism is a segregating hereditary character in 
C. edusa, and Gerould in very extensive experiments upon C. 
philodice and eurytheme has demonstrated the laws of inheritance 
of albinism with large numbers. Judging also from our knowl- 
edge of spotting in general it seems much more probable that 
the aberrant coloration of polonica should be due in part if not 
wholly to hereditary rather than environmental factors. 
