341 



terminal twigs seem to bear a special relation to the sockets of 

 the hairs. 



Whether in any of these cases the ultimate tracheal rami- 

 lications anastomose, I am unable to say. The appearance in 

 Teracolus fausta is strongly suggestive of anastomosis, but I 

 find no absolutely clear e\üdence on the point. The finest 

 terminal twigs are not easily traced, and even the larger 

 capillaries, unless they happen to contain air. can only be 

 followed out with considerable difiicult}-. 



The significance of the special distribution of tracheie to 

 the scent-patches and hair fringes is a matter of conjecture, 

 but that it has some reference to the scent-producing and scent- 

 distributing function of these structures seems certain. It is 

 noteworthy that the fringe of hairs in C. flor ella, which is free 

 from any admixture with scent-bearing scales like those of the 

 patch on the hindwing, is nevertheless well furnished with air- 

 tubes ; and the suggestion may be hazarded that their presence 

 may assist in some way the erection of the hairs or the dispersal 

 of the perfume. But in an}' case their entire absence, so far as 

 has been observed, from the scent-patches in Acmepteron and 

 Dismay phia, is not easy to explain. 



Some of the points dealt with in the present paper have 

 been noticed by Fritz ^Iüllhk, and reference may be made to 

 the English translation by Mr. E. A. Elliott of his Papers 

 on the Scent-organs of Lepidoptera, lately published by Dr. 

 G. B. LoxGSTAFF as an appendix to his book Buftcrfly-hiiiitiiig in 

 Many Lands. 



The paper was illustrated by lantern slides of most of the 

 structures described. 



