( vi ) 



as having a * strong, sweet, " white flower " scent, followed by 

 something more spicy.' 



"Lastly, it may be mentioned that the Geometrid Cartaletis 

 Uhyssa, Hopff., which no doubt belongs to the synaposematic 

 group headed by L. chrysijypus, exuded when pinched a 

 yellowish juice like that of an Acra:a. This juice was 

 scentless. 



" It will be observed that in some of these cases, e. g. in 

 Mijcalesis safjtza, the fragrance resembles that of the Pierines 

 mentioned on a former occasion in being agreeable in character 

 and confined to the male sex. The inference seems fair that 

 odours of this kind are employed as a means of sexual attrac- 

 tion and perhaps of recognition. Mr. Wood-Mason (Journ, 

 Asiat. Soc. Eengal, 1886, Vol. LV, Part II, No. 4, pp. 343- 

 393) found many years ago that the males of several Indian 

 butterflies belonging to the genera Danisejxi, Mycalesis, Lethe 

 and Thmtmantis, exhaled a pleasant fragrance of vanilla, the 

 coi'responding females being scentless; one species of Mi/ccdesis 

 indeed received fi'om Wood-Mason and de Niceville the name 

 of suaveolens on this account. These instances clearly belong 

 to the same category. 



" The case is different with the odours of several Acrwas 

 and some Fapilios, in which the scent has been found to be 

 disagreeable or even disgusting. The possessors of such mal- 

 odorovis perfumes are genei'ally such as we should on other 

 grounds suppose to be distasteful ; and it is significant in this 

 connection that these unpleasant scents are as a rtile shared 

 by both sexes, and indeed often show a marked tendency 

 towards greater intensity in the female. This is of course 

 precisely what we shoiild exj)ect on the hypothesis of their 

 value as a means of protection. 



"In a former communication (Proc. Ent. Soc. Lond., 1905, 

 p. Iv), I mentioned the possibility that both kinds of scent 

 may occur in the same species ; I have some reason to think 

 that this is the case with L. chrysijjpus. The males of three 

 common species of Mylothris, viz., M. agathina, M. rujipellii 

 and M. trimenia, possess a well-marked and very agreeable 

 odour of Avhich the females show no trace (Proc. Ent. Soc. 

 Lond., 1905, p. Iviii). There are, as is well known, strong 



