( cxxix ) 



The scent-scales in TacJiyris doiaitia, the form representing 

 T. nero in the Philippines, are not unlike those of T. nero, but 

 show in some respects a transition from that species towards 

 T. zarinda. Thus, in scales from both fore- and hindwing the 

 base of the lamina exhibits indications of cornua ; in scales 

 from the latter region the apex is prolonged, and the sides of 

 the lamina appear to converge slightly towards the distal 

 margin. The disc, which is elongated and pyriform, 

 approaches T. nero rather than T. zarinda. In the hindwing 

 the elongation of the disc is often extreme. 



With Tachyris Inypo we enter upon a new section, charac- 

 terised by scent-scales with long, narrow laminae and minute 

 accessory discs. There is no definite sex-brand like those in 

 T. celestina and its immediate allies, but there are usually 

 slight differences to be observed between the scales from the 

 fore- and hindwing respectively. 



In T. hippo itself, the scales from the forewing have the 

 lamina elongated, with sides tapering very slightly towards 

 the apex. The base shows a tendency to cornuation ; tlie^ 

 fimbriae are long and wavy ; the disc elongated and very 

 small. The scent-scales from the hindwing are somewhat 

 larger ; moi-eover the sides of the lamina do not converge, but 

 show a slight median compression. In other respects they 

 resemble those from the forewing. 



In Tachyris ada I have not found scent-scales. In T. 

 nephele they occur, but not abundantly. They are of quite 

 the same character as in T. hippo ; the laminae in those from 

 the hindwing are rather longer and narrower than in the rest, 

 and their sides are perhaps more nearly parallel. 



The plume-scales in T. hombronii clearly belong to the 

 hippo group. As in those of the preceding species, the lamina 

 is long, rectangular, with sides very nearly parallel ; the base 

 slightly cornuated, and the disc very small, almost linear. The 

 scales from the hindwing vary somewhat in breadth, but are 

 generally broader than those from the forewing. 



The scent-scales of the hippo group recall those of '^ Fhris- 

 sura " aegis, except for the rounded base of the latter. They 

 may also be looked upon as an enlarged and elongated version 

 of the scales in Saletara liberia and S. panda. 



PROC. ENT. SOC. T,OXD., V. 1909. I 



