( cxi ) 



Another very remarkable scent-scale is that of the Mada- 

 gascar species, Belenois antsianaka. This is very large ; the 

 lamina is somewhat hastate, the sides being convex near the 

 expanded base, concave near the apex. The base shows a 

 tendency towards cornuation, the apex is sharp. The axis of 

 the lamina is occupied by a " core," a mesial streak of the same 

 translucence as the bulk of the scale, with an opaque granular 

 streak on each side of it. At the base of the apical triangle 

 the translucent streak disappears, and the lateral streaks 

 become merged in an opaque granular round or oval mass 

 occupying about half the breadth of the scale at this situation. 

 The chitinous ribbing of the lamina is veiy prominent ; it 

 somewhat resembles the condition o1)taining in Mylothris. 

 The fimbriae are slightly waved near their attachment. The 

 disc is large ; it is chestnut-shaped, and looks dark under 

 ti-unsmitted light. 



A scule of somewhat similar character, but much smaller, 

 and without the central " core," is met with in Belenois icmthe 

 from the West Coast, and B. solilucis from the Nyanza region. 

 Modifications of the same type occur in B. helcida, B. hedyle, 

 B. calypso and B. dentigera. In these the latei-al compression, 

 though present, is much less evident ; the chitinous ribbing is 

 in B. hedyle especially well-defined, and the lamina in this and 

 some otlier species tends to be carved about the vertical axis 

 like the blade of a gardener's trowel. The fimbriae in 

 B. hedyle, B. ianthe and B. solilucis have an S-shaped curve, 

 which may be compared to that of a swan's neck. In 

 B. calypso they appear as if arising from a fenestrated border 

 instead of an entire margin. The lamina in B. thysa is rather 

 long in proportion to its breadth, and the sides a,re parallel. 



The scent-scales of B. grandidieri and B. zochalia are smaller 

 than the preceding, but otherwise not dissimilar. The lamina 

 in the latter species is often slightly unsymraetrical. In 

 Belenois severiria the sides of the lamina are nearly parallel 

 and the base somewhat angular. The apex is sharper in 

 specimens from the West Coast than in those from East 

 Africa. In Indian specimens of B. mesentina the lamina is 

 broad and the apex acute ; African specimens generally have 

 the lamina longer and narrower. The plume-scales of B. java, 



