303 
Geometriclae of the Argentine Repuhlie. 
than Rio Janeiro. As regards the west it seems to occur 
more sparingly in Bolivia and S.E, Peru, and is repre¬ 
sented in E. Peru by a local race or subspecies which I 
propose to describe elsewhere. In Paraguay, about Sapucay, 
there occurs also a very interesting twin species, differing 
structurally in the shorter, more strongly ciliated pectina¬ 
tions of the $ antenna, but otherwise excessively similar, 
and showing a parallel range of variation, though usually 
of a very pale fawn-colour, rarely of the bright yellow 
which is commonest mgladiaria, and further distinguishable 
in the smaller subapical patch, which is usually broken 
up into three black spots, and the sharper postmedian line 
of the undersurface. This is Gynopteryx nitida (Warr.),* 
? = inapicata (Warr.).t It is not a geographical repre¬ 
sentative, for true gladiaria also occurs at Sapucay. 
For the study of the true Gynopteryx gladiaria and its 
aberrations, the brothers Bayne have provided excellent 
material. I have already recorded (Proc. Ent. Soc. Bond., 
1906, pp. XV, xvi) that they have bred the species rather 
freely ex ovo, and have established the identity of most of 
the named forms, which were earlier believed to rank as 
specifically distinct. It is unnecessary to reproduce the 
statistics there given, but I may add that the ^ form 
recorded from San Juan, and which I now take to be that 
indicated by Mr. W. M. Bayne in his note on the parent $ 
of “ brood 1,” seems to be identical with that which Mr. 
Warren has named ennomaria. It appeared also among 
“ brood 4 ” and “ brood 8,” and is therefore clearly not con¬ 
fined to any one season of the year. On the other hand, 
I have not yet seen any more of the nearly uniform, 
purplish brown form (gnaldama, Schaus) which occurs in 
both sexes, and which I still think may be seasonal. 
The range of variation cannot here be exhaustively 
analysed, but it deserves some attention. Guenee’s 
gladiaria (the type form) is yellow, in the $ weakly 
marked, in the $ (as in all ^ forms) with the lines dis- 
* Bruchystichia nitida, AVarr., Nov. Zool., xi, 1.34. 
t Gynopteryx nazadaria, ab. hiapicata, AVarr., Nov. Zool., 
xiv, 307. Certainly not referable to nazadaria, Walk., which 
has the normal pectinations of gladiaria. Seems to agree accur¬ 
ately with a form of nitida that occurs at Sapucay, but as it 
was described from Peru, I think it safer to quote tlie synonymy 
with a query, until confirmatory material comes to hand. In any 
case the short pectinations separate it from gladiaria,, so that it need 
not be fui’ther considered here. 
