( c'i ) 



filigree basket-work, that were scattered over the slide. In 

 appearance they were so dissimilar from the ordinary disc that 

 their real nature did not suggest itself to me; and it was 

 some time before I discovered, from the accidental occurrence 

 of a lamina with the plate still attached, that they were homo- 

 logous with the well-known accessory discs of other Pierine 

 plume-scales. 



In the crimson-tipped group, T. annae, eujDompe, dulcis and 

 danae, the disc is moderate-sized or small, contrasting in a 

 marked manner with the corresponding structure in the 

 purple-tips. The shape of the lamina may be described as 

 ovoid with a sharp apex. The base tends to be squared ; in 

 T. eujjompe the lamina is cordate. T. annae stands somewhat 

 apart from the rest of the group by the breadth of its lamina 

 in proportion to its length. The sides are parallel and the 

 apex less acute. The scale in T. danae is markedly smaller 

 than in the other crimson-tips. 



The plume-scales in T. ephyia and T. etrida are still smaller 

 than those in T. danae, but are of similar general character. 

 In a group composed of T. evipjje, omphale, achine, evanthe and 

 lais the disc is large and the footstalk often straight. Together 

 with a strong family resemblance there are minor points of 

 specific difference. T. antigone presents a broader scale, with 

 a squared instead of a rounded base. The scale appears to be 

 longer and narrower in the wet-season form than in the dry. 

 2\ niveus has a scale of the same character ; in both of these 

 species the disc is large. It is a curious fact that neither in 

 T. auxo nor in T. incretus have I been able to discover any 

 plume-scale or corresponding structure ; nevertheless, I know 

 from my own observation that T. auxo has a distinct and 

 fragrant odour. Both T. evarne and T. phiUipsi, which appear 

 to be nearly related to the species just mentioned, possess 

 plume-scales with small discs, and seemingly scanty in number. 

 It is worth remarking that in T. inrretus, phillijm and evenina 

 many of the orange-pigmented scales of the ordinary kind 

 show a lateral curvature. These curved scales have a rounded 

 distal extremity, with no processes. In T. subfasciatus the 

 plume-scale is long, narrow and laterally compressed, as in 

 Ixias. The disc is small. A still longer and narrower scale, 



