COLIAS EDUSA, FAB. (CROCEUS, FOURC.). 135 
commonest forms. I should consider that in the New Forest it 
represents 20 to 25 per cent. of the specimens captured. 
EXPLANATION OF Puate I. 
Figs. Fras. 
1. Literana, L., strongly marked form. 6. ab. nigro-maculana, n. ab. 
2. », lightly #5 3 7. ab. mixtana, n. ab. 
3. ab. romanana, Fab. 8. ab. irrorana, Hiib. 
4. ab. fulvoliterana, n. ab. 9. ab. squamulana, Hiib. 
5. ab. tricolorana, Haw. 10. ab. suffusana, n. ab. 
(T'o be continued.) 
COLIAS EDUSA. FAB. (CROCEUS, FOURC.): 
ITS SEASONAL FORMS, VARIETIES AND ABERRATIONS. 
By H. Rownanp-Brown, M.A., F.E.S. 
In common with so many of our native or immigrant species, 
Colias edusa, the Clouded Yellow, is entangled in the distracting 
meshes of multiple nomenclature. I do not propose to discuss 
the merits of ‘‘ Hdusa,” except to remark that Fourcroy’s 
(Geoffroy’s) ‘Entomologia Parisiensis,’ where the butterfly 
appears as Croceus, was published in 1785, whereas the volume 
(tom. ii) of Fabricius’ ‘Mantissa Insectorum’ is dated 1787. 
Whether the insect described by Linneus (‘ Syst. Nat.,’ ed. x, 1, 
p- 469, 1758) is or is not our Hdusa—he calls it Hyale——is a 
moot point, but both Esper and Kirby* were satisfied, and 
labelled the species accordingly, and, as a reviewer of the famous 
‘Catalog’ of 1901 points out,+ Staudinger deliberately violated 
the law of priority when he maintained HKdusa. 
In my ‘“ Working List” (‘ Entomologist,’ li, p. 1) and for the 
purposes of this paper, and in view of the nomenclature still 
followed by British lepidopterists, and pending an authoritative 
decision by the International Committee on Nomenclature, I 
reluctantly retain the time-honoured ‘ Hdusa,” though the 
majority of continental lepidopterists have now reverted to the 
older ‘‘Croceus,” and I find that M. Oberthtr, too, adopts Croceus 
in his account of the species in Algeria (‘ Lépid. Comparée,’ 
fasc. x, p. 75). 
My present object is to set forth its seasonal forms, named 
varieties and aberrations, especially as many of our collectors, 
judging from their contributions to this magazine, are not alto- 
gether familiar with the published descriptions even of such as 
oceur periodically in the United Kingdom. 
SeasonaL Forms. 
All evidence available goes to prove that Colias edusa lives 
and often flies continuously throughout the year in the warmer 
* «Cat. Diurn. Lepid.,’ Supplement, p. 799, No. 2, 1877. 
+ ‘Entomologist’s Record,’ vol, xiii, p. 323, 1901. 
