Scent Apparatus in the male of Amauris niavius. 405 
In another paper * Dr. Miiller has described such hairs 
as being present in the costal fold of the wing of certain 
male Hesperidae, such costal folds being undoubtedly 
scent organs. Just recently I have found in the brushes 
of M. mercedonia, particles of a similar nature to those 
found in Amauris. 
The investigation of which the foregoing is an account 
was completed before I had had an opportunity of examin- 
ing Freiling’s account of the morphology of the brush hairs 
in Euploea asela and Danaida septentrionis.t 
Freiling is of opinion that in these species it is the brushes 
themselves which produce the scent. Excellent figures are 
given showing glandular cells from which the brush hairs 
are developed, and also drawings of the hairs showing pores 
in their walls through which he supposes the scent material, 
produced by the glandular cells, to be discharged. I 
have not yet succeeded in obtaining suitable material to 
enable me to confirm this author’s results. The hairs of 
the brush in D. septentrionis are of a quite different structure 
to those in A. mavius. So much can be seen from hairs 
taken from a dried specimen, but the existence of pores 
is not very obvious.{ The species has a scent pocket in 
the hind-wing, but Freiling seems to have been unaware 
of the connection between the scent pockets and the 
brushes in these Danaines. I have no desire to throw doubt 
on his results, which have evidently been obtained with 
great care and a mastery of technical skill. The abdominal 
brushes may in some species produce the scent, but I am 
not satisfied that in A. mavius, at any rate, they have 
more than a mechanical function. Freiling makes no 
mention of the filamentous hairs which I find in Amauris. 
* “On the costal fold of Hesperidae.’ Archivos do Museu 
Nacional do Rio de Janeiro, III, 1878, pp. 41-50. English trans- 
lation by E. A. Elliott in Longstaff’s ‘* Butterfly Hunting in Many 
Lands,” Appendix, p. 640, 1912. 
{+ “ Duftorgane der weiblichen Schmetterlinge nebst Beitriigen 
zur Kentniss der Sinnesorgane auf dem Schmetterlingsfliigel und 
der Duftpinsel der Minnchen von Danais und Huploea.’’—Zeit. f. 
wiss. Zool., pp. 210-290, pl. 12-17, 1909: H. H. Freiling. 
t From an examination of the dry brush hairs in some other 
species of Amauris I am inclined to think that pores do exist in the 
brush hairs of some species. I hope soon to have suitable material 
to enable me to make a more exhaustive study of this and other 
interesting features. 
TRANS. ENT. SOC. LOND. 1913.—PaRT II, (SEPT.) DD 
