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§ VI. On the Scent-organs of Antirrhaea archaea, Hiibn . 1 
Plate E. 
The sexual difference in [the Satyrine butterfly] Antirrhaea archaea', 1 
produced by the scent-organs of the males, has been mentioned by various 
authors. Thus Westwood {Gen. Diurn. Lepidopt ., 1851, p. 365), makes 
Antirrhaea the third section of the genus Haetera , and distinguishes it by the 
[fore]-wings of the male being dilated on the inner margin and furnished 
with a mane-like hairy tuft beneath. Butler {Cat. Satyr id. Brit. Mus ., 
1868, p. 106), taking Antirrhaea archaea as the type of a new genus, 
Ancliiphlebia , mentions among the distinctive characters of this genus not 
only the convex inner margin and the “ plaga pectinatim cirrosa [cirrata] ” 
of the fore-wings, but also a very noticeable difference between the two sexes 
in the neuration of the hind-wings :—“ alae venis posticarum prima et 
secunda subcostalibus ad origines mari valde approximatis et subparal- 
lelis.” Butler, at the same time, illustrates the characters in question by 
a figure (I. c., PI. V. 3). 
Now tufts of hair, beards or manes, are in general the chief part of 
the scent-organs of male Lepidoptera : in most cases also, these organs 
are accompanied by more or less profound modifications of the nervures of 
the wings. It seems therefore very strange that the males of Antirrhaea 
archaea should have a mane on the fore-wings, and modified veins in the 
hind ones, since, according to existing descriptions and figures, these hind- 
wings show no indication of any scent-organs. In consequence of this 
anomaly, real or apparent, I examined with the keenest interest several 
individuals of both sexes of this somewhat rare butterfly, which I met 
with for the first time in the Province of Santa Catharina in January of 
the present year. 
As soon as I took hold of them, I was convinced that the males, and 
these only, were endowed with a most distinct scent, emitted from the 
very elegant mane on the fore-wings. Nor was I long in recognizing that 
the anomaly is only apparent, for a scent-organ of a most peculiar kind 
extends along the modified nervures of the hind-wings, and, comparing 
my specimens with Butler’s plate, it required little to convince me that 
1 Archivos do Museu Nacional do Bio de Janeiro , III. (1878), pp. 1-7. By Dr. 
Fritz Muller, Travelling Naturalist for the National Museum. 
2 Antirrhaea archaea , female, is figured by Dr. Chenu, Encyclop. d'Hist. Nat., 
Pavilions, I., p. 299, Fig. 514.—F.M. 
