( cxviii ) 



/'. viardi, 'pyloii^ and apicalis the fimbriae are unusually long. 

 The disc in several of the species has an evident proximal 

 orifice ; this in F. apicalis is exceptionally distinct, and is 

 furnished with a chitinous rim. Some of the ordinary scales 

 in P. ntardiia are peculiar, being shaped somewhat like a 

 green fig, and heavily loaded with })igment. 



In Fieris phileta, more generally known as F. nioniiste, the 

 scent-scales ai-e numerous. They are much like those of 

 2^. tit/toreideii and F. demophile, but larger. The base is 

 rounded and somewhat narrowed ; the sides divei-ge towards 

 the apex, which is sharp. The disc is small, triangular, and 

 possesses an evident aperture. The fimbriae are rather long, 

 straight and distinct. 



Coming now to what I have called the second section of 

 Fieris, Ave find plume-scales of a very different type from those 

 just described. The laminae are exceedingly long and naiTow, 

 with a more or less i-ounded base. The apex is seldom quite 

 so filamentous as in many species of Delias, but the general 

 contour and to a great extent the sculpturing of the lamina is 

 strongly reminiscent of that genus. A well-marked point of 

 difference, however, exists in the disc, which in this section of 

 Fieris is extremely small. A conspicuous peculiarity of the 

 assemblage now under notice is the localised distribution of 

 the scent-scales on the surface of the wing. If the male of 

 one of these butterflies, say F. yhaloe or F. huniae, be ex- 

 amined, it will be seen, as has indeed been pointed out by 

 Dr. Butler, that the vipper surface of both fore- and hind- 

 wing is divided between a smooth and a mealy or rough- 

 ened aren, the difference of texture between the two being 

 on a naked-eye view very like that which is apjiarent on the 

 wings of male individuals of the genera Catopsilia and Calli- 

 dryas. In these .species of A'er/.s, however, the roughened area, 

 instead of constituting a kind of border to the wings, occurs in 

 the form of streaks which follow more or less closely the 

 course of the nervures, ending in a tapering extremity as the 

 margin of the wing is approached or reached. These rough- 

 ened or mealy streaks, which are easily visible to the naked eye, 

 mark the situations where the plume-scales are to be found. 

 Here the.«e structure?;, which are very easily detached, are so 



