Papilio dardanus (merope) and Acrea johnstoni. 307 
(5) The discal white patch on the hind-wing of the 
female /ycoa is somewhat larger than in johnstont : more- 
over it is rounded and not subquadrangular as is the buff 
patch of the eastern form, although rare exceptions both as 
regards contour and tint are not wanting in the latter. 
The rounded margin of this patch in the female lycow is 
more invaded by internervular radii than in johnstone, 
and consequently less sharply defined. Outside the discal 
patch the strong development of these dark radii contrasted 
with the paler (greyish or rarely brown) ground colour pro- 
duces a very ditferent effect from the almost uniformly 
dark appearance of the corresponding area in johnstone. 
When we reach the western part of Uganda, in the 
uplands of Toro, at a height of 79000 feet, /ycow is still a 
dominant Acrva. The only male I have seen resembles 
the western form except that there is a slight tendency 
towards the development of a buff discal patch in the hind- 
wing. Some of the females resemble those of the west 
coast except that the white discal patch is very slightly 
smaller: in others the four white spots of the fore-wing 
are widely separated and smaller, approaching the con- 
dition of johnstoni, while in these very individuals the 
discal patch of the hind-wing is smaller and more sharply 
defined. In all other respects the western characters 
described above are still maintained. 
Passing still further east to the N.W. shore of the 
Victoria Nyanza at Entebbe, we find that the males 
have now gained the four widely separated buff spots in 
the fore-wing, not nearly so distinct and sharply defined 
as those of johnstoni, but otherwise very similar. Many 
individuals have a small trace of the buff discal patch. 
All the females I have seen resemble the most johnstont- 
like of those from Toro, except for the tint of the discal 
patch of the hind-wing, which has become a very pale 
buff. These females are nearly indistinguishable from the 
kilimandjara figured by Oberthiir * (=/allav, Rogenh.). 
Owing to the kindness of my friend, Mr. T. T. Behrens, 
R.E., I have had the opportunity of examining a pair of 
this form from the Anglo-German boundary west of the 
Lake, but not more than sixty miles from it. While the 
female resembles those from Entebbe, the male has a far 
’ * Etudes D’Entomologie: Dix-septitme Livr.: Avr. 1898, Pl. I, 
5 1G 
