Pseudacrea poggei and Limnas chrysippus. 267 
each of them resembles the other more closely than it 
resembles the model. 
The internal contour of the black hind-marginal border 
of both wings is prolonged inwards along the veins, produc- 
ing a festooned appearance in pogget (Fig. 3) and, to a far 
smaller degree, in the model (Fig. 1). In the 2 misippus 
(Fig. 2) this feature is almost wanting. Apart from the 
contour, the narrow black border of the hind-wings 
of pogget more closely resembles the model than the 
broader more interrupted and less sharply outlined border 
of the 2 misippus. At the same time, the two mimics 
resemble each other in this character more fully than 
either of them resembles the model, which is widely 
separated by the row of distinct white spots, which 
however are very variable, and not infrequently barely 
traceable. On the under-side of both wings the border 
of misippus (Fig. 2a) reproduces the black and white 
effect of the model (Fig. la), far better than poggei (Fig. 
3a), in which the white marginal elements are confined 
to the fringe. On the other hand, in the lighter tint of 
the veins of the hind-wing under-side and in the colour 
and texture of the ground-colour, poggei is by far the 
better mimic of the two, while mzsippus is equally superior 
in the tint of the apical area of the fore-wing under-side 
beyond the bar. As regards the black discal spots of 
the hind-wing under-side poggei is the closer mimic. The 
development and shifting outwards of the peripheral spots 
is an evident special modification, in the direction of the 
model, of a characteristic feature of the genus Pseudacrea. 
The two small spots nearest to the centre of the wing 
(see Fig. 3a) were only seen in a single specimen out of 
the seventeen. They indicate the existence of material 
which may be developed into a still closer likeness to the 
Danaine model.—E. B. P. 
