Pscudacrxa 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 poggci (Fig. 3) and, to a far 

 smaller degree, in the model (Fig. 1). In the ^ misip>pus 

 (Fig. 2) this feature is almost wanting. Apart from the 

 contour, the narrow black border of the hind -wings 

 of poggci more closely resembles the model than the 

 broader more interrupted and less sharply outlined border 

 of the % mi&ippns. 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 poggci (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 misippus 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 Psendacriea. 

 The two small spots nearest to the centre of the wing 

 (see Fig. 3«) 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. 



TRANS. ENT. SOC. LOND. 1905. — PART II. (JULY) 18 



