Faiyilio dardanus (merope) and Acrsea johnstoni. 307 



(5) The discal lokitc patch on the hind-wiug of the 

 female hjcoa is somewhat larger than in johnstoni : more- 

 over it is rounded and not subqiiadrangular as is the huff 

 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 lycoa is 

 more invaded by internervular radii than in johnstoni, 

 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 different effect from the almost uniformly 

 dark appearance of the corresponding area in johnstoni. 



When we reach the western part of Uganda, in the 

 uplands of Toro, at a height of 7-9000 feet, lycoa is still a 

 dominant Acnva. 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 smalh trace of the buff discal patch. 

 All the females I have seen resemble the most johnstoni- 

 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 

 Idlimandjara figured by Oberthiir * {—fallax, 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-septicme Livr. : Avr. 1893, PI. II, 

 f. 17. 



