( 32 ) 



in the membrane of the wing. In these cases the escape of 

 the odour into the open air doubtless took place through the 

 distal fimbriae with which scales of this type were usually 

 provided ; but Dr. Lamborn's observation suggested that the 

 anal tufts acted as mechanical dispersers of an odour produced 

 elsewhere, rather than as themselves directly connected with 

 a secretory apparatus. The fact that in Catopsilia not only the 

 Colias-likQ patch, but also the tuft or fringe, possessed a special 

 supply of tracheal branches, seemed adverse to the idea that the 

 fringe, in this instance, acted as a mere scent-sprinkler ; that 



[xxx\ ii 

 is, if the speaker's interpretation of the presence of tracheae 

 were correct. It would be interesting, in view of Dr. Lam- 

 born's observations, to know whether the anal tufts in Amauris 

 were in connection with any secreting cells or other similar 

 apparatus. For this purpose no information could be expected 

 from dried specimens, and it would be most desirable to have 

 fresh material treated with proper reagents on the spot, and 

 so sent home in a condition fitted for microscopic examination. 



Professor Kkllogg of California, who was present as a 

 visitor, called attention, in connection with Dr. Dixey's 

 remarks, to a paper by Mr. B. Thomas, of Cornell University, 

 on the scent-glands in the wings of butterflies. In this paper 

 Mr, Thomas described certain unicellular glands at the base 

 of the androconia, which presumably could be interpreted as 

 the producers of the scent stuff given off by the androconia. 

 Professor Kellogg aided that in sections of wings made by 

 himself he had noticed similar glands. It would be difficult 

 to prove the actual continuity of the glands and scales, 

 because <>t the peculiar mode <'t attachment of the scales to 

 the wings, viz. by the insertion of a bulb like expansion of 

 the pedicel of the scale into ;t small pocket or cup in the 

 membrane, the base of the scale ami the membrane being 

 quite discontinuous. 



Dr. I ) i x i : v , in thanking Professor Kellogg tor his interest- 

 ing observations, observed that the expansion of the pedicel 

 was not really a bulb, but a disc. 



