154 Dr. H. Eltriiigham's Further Observations on the 



every way with the " yellow hairs " * in the brush of 

 niavius. PI. XI, fig. 1, is a photograph of a section of 

 the brush near the base. It will be noted that there are 

 a few small dark-coloured hairs near the middle. These 

 resemble similar hairs in the brush of A. whytei, but they 

 are fewer in number and much shorter. A little further 

 from the base the brush-bag becomes deeply convoluted 

 on its inner side and bears great numbers of small cells, 

 from which arise delicate filaments similar to the " dust- 

 hairs " in A. niavius. PI. XI, fig. 2, is a photograph of 

 a section across this area. In the latter species these 

 dust-hairs, though numerous, are almost insignificant 

 compared with their development in psyttalea. In the 

 latter they form the most conspicuous feature of the 

 brush, and are produced in enormous quantities. They 

 arise from cells all round the brush-bag, and in section 

 they form a dense ring enclosing the yellow pencil. PI. XI, 

 figs. 3 and 4, show the appearance of sections of the 

 brush near the middle, and towards the outer end, re- 

 spectively. The dust-hairs extend to the end of the 

 brush, where they show the same tendency to break up 

 into particles. From an area some little distance from 

 the basal end of the bag there arise the black hairs similar 

 to those in niavius. These can be seen in figs. 3 and 4. 



The prolific production of dust material in A. psyttalea. 

 as shown by microscopic examination, is interesting when 

 considered in conjunction with Dr. Carpenter's observa- 

 tions on the courtship of the species. Dr. Carpenter's 

 note was read by Prof. Poulton at the meeting of the 

 Society on December 2nd, 1914, at which I exhibited photo- 

 graphs of sections of Danaine scent-organs illustrating the 

 present paper. His remarks were as follows : — 



" On July 21 [1914] at the edge of the forest here on 

 Kome Island, about 5 p.m. I saw the courtship of Amauris 

 psyttalea, Plotz. I noticed two flying about, obviously a 

 male pursuing a female. Presently the latter settled on 

 an erect dead flower-spike of an aromatic Labiate, about 

 two feet above the ground. She sat with head upwards 

 and body perpendicular, wings outspread at right angles. 



* I have referred throughout to these hairs as the " yellow 

 hairs," since they are of that colour in all my preserved specimens. 

 As Dr. Carpenter, in the observation quoted below, speaks of them 

 as " quite white '* in the living insect, I conclude that they become 

 yellow after immersion in preservatives. 



