( viii ) 



fluid from the anteuna3 so usual in coUt'ctiog that he shifted 

 his specimens in papers after a short time to prevent them 

 adhering to the envelopes. 



A discussion followed on the organs and uses of scent for 

 purposes of attraction and defence in insects generally, Mr. 

 J. W. TuTT drawing attention to the fact that there are two 

 glandular scents in Lepidoptera : the one emanating from the 

 androconia ; and the other from the body, and that in determin- 

 ing the scent peculiar to the various species they must be 

 distinguished. 



Professor Poulton, in congratulating Dr. Dixey and Dr. 

 Longstaff upon the interesting results of their careful observa- 

 tions in the field, referred to the fact that the scents observed 

 in the males alone, and presumably epigamic in significance, 

 were pleasing to the human sense, whereas those common to 

 both sexes, and presumably aposematic, were unpleasing to 

 man. Ex hypothesi, the first set appealed to the sense of the 

 female insect, the second to that of insect-eating vertebi'ates. 

 That the former should be agreeable to man appeared to be 

 a far more astonishing result than that he should find the 

 aposematic scents unpleasant. Professor Poulton also 

 mentioned having seen in a dissection of the larva of 

 Cossus, prepared by Mr. O. H. Latter, a long tubular 

 gland emitting the odour peculiar to that species. The 

 President, Dr. T. A. Chapman, Mr. G. Bethune-Baker, 

 Mr. M. Burr, Mr. G. J. Arrow and other Fellows continued 

 the discussion, at the close of which Dr. Dixey replied, 

 reminding Mr. Tutt that he had already dealt with " andro- 

 conial" scents on two former occasions. It was of course 

 true, as he had previously stated (Proc. Ent. Soc. Lond. 1904, 

 p. Iviii) that the sexual scent in many Pierines, Lyctenids, 

 Satyrids and Nymphalids was distributed, though not manu- 

 factured, by specialised scales either scattered over the wings 

 or collected into patches. At the same time it was worth 

 noticing that in some species, e. g. Ganoris hrassicse, which 

 were plentifully supplied with " androconia," the scent was 

 barely or not at all perceptible ; while in Go')iepteryx rhamni 

 and G. cleopatra, both of which, and especially the latter, had 

 been found to possess a flower-like odour, he had been unable 



