xxir 



margin of L. Catreus de Nic, especially in the 9, (Plate XXII, "jSd) where 

 it often shows through from the upperside, but the surface of both wings has 

 otherwise largely faded to white, upon which this pigment only survives as 

 numerous litde spots, while in L. Puspa Horsf. (Plate XXII, 74) and L. Cossaea 

 de Nic. (Plate XXII, 75) it is partially concentrated into the circular spots 

 already referred to. It is remarkable, that in this respect, when the underside 

 of different species has become very white, the arrangement of the small sur- 

 viving black spots still distinguishes the different species, but that they do not 

 differ in the sexes of the same species. This may be seen, for instance, on 

 the underside of the cf of L. Ceyx de Nic. (PI. XX, jga.d.) and L. Cyani- 

 coRNis Sn. (PI. XX, ']ba.b.) cT and ?, although it is not shown very clearly 

 in the accompanying illustrations. 



The structural blue, which has subsequently covered the darker spots, at 

 least on the upperside, is still found on the upperside of both the wings of 

 the cf in L. Coalita de Nic. (Plate XXII, 77a), L. Catreus de Nic. (Plate 

 XXII, 78a), L. Cyanicoknis Sn. (Plate XXII, 76a), L. Puspa Horsf. (Plate XXII, 74a), 

 and L. Cossaea de Nic, (Plate XXII, 75^) in various lighter and darker shades, 

 according as the sublying pigmental colour is more or less faded. Further in the 

 cf of L. Ceyx (Plate XXII, 72^) on the primaries only, while upon the secon- 

 daries, which have already become white. It is only found as a relic colour. 

 As such it is also found in a greater or lesser degree upon the upperside of 

 both wings in the cf of L. Marginata de Nic. (Plate XXII, 73rt), the v of 

 L. Coalita de Nic. (Plate XXII, TTb), L. C-yanicornis Sn. (Plate XXII, 76(5), 

 L. Ceyx de Nic. (Plate XXII, ^()b), and L. Cossaea de Nic. (Plate XXII, -j^b). 



White, finally the most advanced stage, has more or less absorbed both 

 wing surfaces in some species, as in both sexes of L. Quadriplaga Sn. 

 (Plate XXII, 72) and in the 9 of L. Ceyx de Nic. (Plate XXII, ^c^b) while in 

 others, as the male of L. Ceyx de Nic. (Plate XXII, 7ga), it covered the 

 upperside of the secondaries only, and in yet other species, such as both sexes 

 of L. Cyanicornis Sn. (Plate XXII, 76), only the underside. Various of the 

 accompanying illustrations show this plainly enough. In some species the white 

 is, as it were, breaking through the blue, causing the darkening and with it the 

 structural colour to disappear. This process is clearly further advanced in one 

 individual than in another, as e. g. in the cT of L. Coalita (Plate XXII, yja.b.), 

 in L. Ceyx de Nic. (Plate XXII, 79a) and L. Puspa Horsf. (Plate XXII, 74^) 

 also this is found on the upperside of both wings. 



Thus we see clearly, how one process of colour-evolution governs all these 

 species, always approaching the same object in the same way, but working inde- 

 pendently and therefore very unequally in each species, sex and even individual. 



