( cxxvii ) 



in great abundance plume-scales of a very different character 

 from those si)ar.sely distributed over the forewing. These 

 " brand-scales," as they may be called, have a lamina which is 

 sagittate or hastate, the sides converging regularly from base 

 to apex. The laminae vary somewhat in length and breadth, 

 but the apex is always sharp and the basal cornna distinct. 

 The fimbriae are rather short, generally straight, but with a 

 sharp curve near the distal termination. These laminae are 

 considerably larger than those of the forewing, but the most 

 remarkable thing about the brand-scales is the enormous size, 

 both relative and absolute, of the accessory disc. This is 

 sometimes quite half the size of the lamina itself ; it is pear- 

 shaped, occasionally with a distinct narrow proximal prolonga- 

 tion. There is an evident proximal aperture, and the 

 internal chitinous tubing is distinct. The footstalk is straight 

 and rather wide. A feature to be found, as above noted, in 

 very many species, is here well-marked • viz. that the ordinary 

 scales from the forewing tend to be dentated distally, whereas 

 in those from the hindwing the distal margin is usually^ 

 smooth. 



In Tachyris dementina there is less difference than in the 

 preceding species between the scales of the sex-brand and 

 those of the general surface. The latter on the forewing are 

 scanty ; larger than the corresponding scales in T. celestina ; 

 the lamina is cordate, with sides curving convexly from base to 

 apex ; the apex is sharp ; the base has no distinct cornua ; the 

 modeiutely large disc is provided with a proximal aperture. 

 T. Clementina possesses a sex-brand on the hindwing like that 

 of T. celestina. The plumules in this situation are abundant, 

 the laminae are cordate, with the apex prolonged and very 

 sharp. The basal cornua are strongly developed ; the disc is 

 large, pyriform, with proximal aperture. Under a low power 

 and by transmitted light the disc looks dark in comparison 

 with the lamina ; this is probably due to its well-marked 

 internal system of chitinous tubing. 



The forewing of Tachyris placidia contains numerous scent- 

 scales ; these are large, subcordate and broad. The cornua 

 are remarkable, being very long and tapering ; they are often 

 waved, and are turned inwai'ds so as almost or quite to meet 



