154 THE KENTOMOLOGIST. 
ABERRANT Forms. 
(a) Forms Tending to Albinism. 
The oldest described and figured varietal form of Colias edusa 
is that figured and described by Huebner (‘ Eur. Schmetts,’ 1, 
figs. 440, 441, 1803 2). 
(a) Ab. 2 Helice, Hb. (= europome, Stephens). Until Tutt in 
1896 invented Pallida for the white form, all pale aberrations of the 
female tending to albinism were lumped together under Helice. 
To take two authors only, Duponchel (vol. i, p. 48) says that the 
variety (stc) is distinguished from the type by the ground-colour 
of all the wings, and the spot in the marginal band being whitish; 
Barrett, that the whitish forms are known by the varietal name 
of Heltce. A glance at Huebner’s figures is sufficient to convince 
us that he meant to indicate a form in which the ground-colour 
was pale creamy white, i.e. with a tinge of yellow in the pigment. 
In fig. 440, as seen in the copy in the Library of the Natural 
History Museum, South Kensington, it is impossible to mistake 
this creamy tendency—the colour of a vanilla cream ice; but it 
is only very slightly so, and neither figure displays the same 
Chinese white used, for example, to depict the male of Pieris 
brassice (fig. 401). Fig. 441 is even lighter, but still to my eyes 
separable from the extreme Pallida form. The creamy spots in 
the black marginal bands, of course, vary both in depth of colour 
and in number and size, as in the typical female. I believe no 
example of a male Helice or Pallida has ever been reported 
authentically, and the same remark applies to the other yellow 
species of the genus Colias. In Barrett’s figures (pl. vi, 1c, le) 
both are decidedly cream coloured, 1c less so than 1e. 
Ab. Helice is then properly described by Tutt as pale lemon 
or cream yellow. All British examples in my collection, taken 
at Bonchurch, I.W., August, 1877, correspond to this form. 
Twelve aberrations of the type are shown, but not numbered, 
on the excellent plate published in the ‘Entomologist’ in March, 
1878.* In no one of the Helice forms figured does the coloration 
approach that of Pallida. 
Ab. Ridicula, Alpheraky (‘ Hor. Soc. Ent. Russ.,’ vol. xxxviii, 
p- 519), a South European form, ‘‘ white as Helice, ‘but half as small 
again,” hardly seems worthy of a name; if so, it may be con- 
sidered generally under ab. minor, Failla, and Dr. Verity figures 
it as such (‘ Entomologist,’ vol. EXXVii, pl. 4, fig. 4). 
(bo) Ab. Helicina, 2, Oberthur (1880) (‘ Etudes Entomolo- 
giques,’ xx™ livr., pl. vi, fig. 96; ‘ Rhopal. Palearct.,’ pl. xlix, 
fig. 40). Ground-colour very pale yellow with bright saffron or 
rosy glaze. Intermediate between the typical yellow and the 
whitish forms. Described from an example captured in the 
author’s garden at Rennes. There are two British examples in 
* ‘Colias edusa,’ by Edward A. Fitch, vol. xi, pp. 49-61. 
