510 Mr. R. Trimeu on Mr. Millar's Experimental 
Euralia is in contrast to the comparative frequency of 
linking intergrades among the polymorphic mimetic forms 
of the ^ Papilio dardanus throughout all the sub-species 
of that extraordinary butterfly; and it is the more notice¬ 
able because in the cenea sub-species of P. dardanus, 
inhabiting the same districts as the Euralia under notice, 
the two more numerous mimetic forms shown by the ^ 
{cenea and liip)pocoon) simulate respectively the very same 
species of Amauris —viz. A. alhimaculata and A. niamus 
sub-sp. dominicanus —that are the models of the Euralia. 
As already indicated above (p. 499) E. wahlbergi and 
E. viima are very closely-allied south-eastern representa¬ 
tives of the western and equatorial E. anthedon and 
E. diibia respectively, and there can be little if any doubt 
that the latter will be proved, as the former have been, to 
be two co-existing forms of one species, usually if not 
always present in the offspring of a single mother of either 
form. Valuable evidence in this direction has already 
been furnished by three West-African examples—kindly 
brought to my notice by Prof. Poulton in the collections of 
the Hope Department of the Oxford Universit}’’ Museum 
—intermediate between anthedon and duhia. The first of 
these from the Lower Niger (W. A. Forbes) is much closer 
to duhia than to anthedon, the median Avhite macular band 
of the fore wings being situate as in duhia but much 
enlarged and with its component spots confluent; some of 
the white spots of the submarginal series are absent. The 
second, from the Gaboon (Mark L. Sykes, circa 1888) is 
nearer anthedon, but in the forewings the large inner- 
marginal pale space is obscured with dull violaceous-blue 
except for a good-sized elongate white spot between 1st 
and 2nd median nervules, while thesub-apical white bar is as 
clearly defined and fully developed as in normal anthedon ; 
and in the hindwings the white area is somewhat restricted 
and externally tinged not with the usual blue gloss but 
with ochrey-yellow (as sometimes in duhia) : in both wings 
the submarginal white spots are only partly represented, 
but those present though obscured with dusky scaling are 
enlarged. The third, from Camaroon, is in pattern gener¬ 
ally like the second, but the colouring is very mixed : in 
the forewings the sub-apical bar is interiorly much obscured 
with black irroration; the upper part of the inner-marginal 
patch is larger than in the second example and of a purer 
white, but all its lower part is clouded with obscure ochrey- 
