alia 
systematists will be less willing, I presume, to agree with mein the 
following case of polymorphism, which is indeed startling enough 
to make anybody hesitate to believe in the correctness of the 
svstematics as I present them here. We figure thirteen males, all 
from West Africa (pl. XXII). These specimens are considered 
to belong at least to seven distinct species. The result of my 
investigation is quite different; I must regard these Insects as 
forms of only one single species, Pseudacrea eurytus L. (1758). 
The specimens figured do not represent geographical races, 
although there may be this much geographical in them that only 
a certain number of the forms occur in the same limited locality. 
Along with these Psewdacrwe is placed a series of thirteen males 
of Planema, each Pseudacræa resembling more or less closely a 
Planema. The differences in colour between the specimens of 
Planema being no greater or hardly so great as between the various 
forms of Pseudacrea, it is startling to find that the Planema 
belong to no less than twelve distinct species. 
The female sex of Pseudacrwa eurytus is as variable as the male. 
Some forms agree with a c'-form, while others have a white band 
instead of the orange one of the corresponding male. The females 
of eurytus resemble the females of the different Planemas. The 
white-banded females of Planema are so very similar to each 
other that systematists have repeatedly confounded them. Even 
AURIVILIUS, in his great work on African Butterflies, was unable 
to distinguish the females of several species, owing no doubt to the 
insufficient material he had at his disposal. We figure five white- 
banded female specimens of Pseudacrwa eurytus together with the 
females of five species of Planema (pl. XXIII). 
The phenomenon also holds good in other districts where 
P. eurytus is found. In Uganda, for instance, this Butterfly is 
represented by a number of forms more or less different from the 
West African ones. For the sake of brevity we will refer only to 
two, which were described as distinct species, lerra NEAVE (1904) 
(ol. XXIV, fig. 284) and obscura NEAVE (1904) (pl. XXIV, 
fig. 304). The one resembles Planema epwa paragea (GROSE- 
SMITH (1900) (pl. XXIV, fig. 30) and the other Planema tellus 
platyxantha JORD. (1910) (pl. XXIV, fig. 28). We figure an inter- 
mediate specimen (pl. XXIV, fig. 294) connecting the two 
Pseudacrwe; needless to say, there is no connecting link between 
the two Planeme. 
