534 Professor E. S. Poulton's Note, on the 



the fore- and hind-wings are sufficiently separated to 

 produce a notch far deeper than any]other in the irregular 

 contour. 



The upper surface of - D meenta rusina exhibits an almost 

 uniform pale brown colour with a narrow darker margin. 

 Both wings are marked with reticulations of a tint faintly 

 darker than the ground-colour, and barely visible at a 

 little distance. The ground-colour is also very faintly 

 deepened in tint at the extreme margin of the transparent 

 networks. Although this deepening requires the use of a 

 lens for its due appreciation, its effect upon the unassisted 

 eye is undoubtedly considerable, the patches gaining a 

 sharper outline and a greater prominence. Along the 

 costa of the fore-wing the linear margin is made up of an 

 irregular alternation of dark and light sections. The 

 effect is to break up the hard line of the costa and produce 

 the appearance of an outline eaten at irregular intervals 

 into little shallow bays, each corresponding to one of the 

 light sections. 



The chief projecting angles bounding the deeply cut 

 bays along both hind margins curve either upward or 

 downward out of the plane of the wings. Corresponding 

 angles on the two sides are bent in the same direction in 

 Mr. Kaye's specimen, and thus probably retain the appear- 

 ance presented in life, an appearance promoting the cryptic 

 resemblance to a tattered piece of dead leaf with the most 

 prominent angles of its margin bent or twisted. The 

 curvature is chiefly marked in the principal or costal angle 

 of the small bay at the extreme apex of the ■ fore-wing, 

 and is here in a downward direction. The three chief 

 projections near the anal angle of the same wing are on 

 the other hand bent upward. In the hind-wing the 

 curvature is much less pronounced, the chief projection 

 at the apical angle being bent very gently downward, 

 that at the anal angle rather less gently upward. 



Transparency is attained very much as in Castnia* by 

 the scales themselves becoming transparent and, at least 

 in some of the areas, set on edge. The obliquity of the 

 scales varies in different parts of the wing, but in the most 

 completely transparent patches the two causes, — trans- 

 parency and verticality, — always co-operate, and of the two 

 the latter seems to be the more effective. The evolution 

 of a transparent area from one in which the same effect 

 * Linn Soc. Journ.— Zool., vol. xxvi, p. 601, PI. 44, Fig. G. 



