( cxxvi ) 



The sides are slightly conv^ex, usually converging towards the 

 apex, which is sharp. The fimbriae are rather short ; the base 

 has its angles slightly rounded off. The disc is spheroidal or 

 chestnut-shaped. 



lu both species of Saletara the scent-scales are numerous. 

 They are small ; in S. panda markedly smaller than the 

 ordinary scales. Tlie laminae in S. liheria are somewhat 

 variable in length and breadth ; they are usually constricted 

 in the middle, and are occasionally goblet-shaped. The fimbriae 

 are distinct ; the base well rounded ; the disc small, narrowly 

 conical, and proximally truncated. S. panda has plumules 

 similarly variable in shape ; like the last they show a 

 median constriction and a well-rounded base. The disc again 

 is small, almost linear, and presents a similar proximal 

 truncation. 



We now come to a group of these brush-tailed Pierines, the 

 members of which possess certain obvious characters in com- 

 mon. This is the group to which Mr. Wallace's original 

 generic name of Tachj/rls is still applied. It appears to fall 

 into two sections, the first of which consists of Tachi/ris celes- 

 iina, Clementina, placidia, zarinda and iiero. The mutual 

 afiinity of these forms is borne out on an examination of their 

 scent-scales, as regards both their structure and their dis- 

 tribution. The most noticeable characteristic of the assem- 

 blage from this point of view is the large size and usually 

 pyriform outline of the disc. Another remarkable feature is 

 the difference in the shape and size of the scale, and in the 

 relative proportion of its several parts, according to the region 

 of the wing from which it comes. 



Thus, on the forewing of Tachi/ris celestina ^ , the plume- 

 scales, which are not numerous, somewhat resemble those of 

 Appias Hbythea, having the sides parallel or with a very 

 slight distal convergence ; the fimbriae straight and rather 

 short; the base squared, with a bare indication of cornua. 

 The disc is moderate in size and peai--shaped. But if the 

 hindwing be carefully examined, a patch will be observed 

 about half-way along the inner margin, which is distinguished 

 by its paler colovu- fiom the general blue tint of the upper 

 surface. This patch is practically a " sex-biand." It contains 



