38 ENTOMOLOGICAL SOCIETY 
mals, even in a very small room. The aquarium consists of a tin 
box one foot square in front and about three inches thick, with a 
glass front. Over this glass front slips a round-oval picture-frame. 
If the inside is painted and filled with water the whole looks like 
a suspended picture of rather unusual thickness. Several such 
aquaria can be grouped together like so many pictures. If con- 
nected by syphons carefully graded, a constant flow of water can 
be obtained, which produces the necessary current and supplies 
the needed amount of oxygen. In such aquaria aquatic larvae and 
insects can be studied with great convenience. The addition of 
some water plants adds greatly to the beauty of these aquarial 
pictures. 
Mr. Smith read the following abstract of a paper by Prof, von 
Dalla Torre, entitled "Die Duftapparate der Schmetterlinge " 
(Kosmos, xvii, pp. 354-364, Nov., 1885; pp. 410-422, Dec., 
1885): 
THE ODORIFEROUS APPARATUS IN LEPIDOPTERA. 
The author starts with a statement of the facts that led to the discovei y 
some time since that the female of many Lepidopterous insects gives out an 
odor perceptible to the male, and thus induces copulation. Of the anatomy 
of these organs nothing definite is yet known, but it seems proven that by 
extending the ovipositor the 9 can cause the dissemination of the odor 
which attracts the ^. 
He mentions the discovery by Fritz Miiller (Zeitschr. fiir wissensch. Zoo- 
logie, xxx, p. 167) that a butterfly, the larva of which feeds on the " mara- 
cuja," has in both sexes an organ exhaling a very offensive odor, which he 
deems protective. In the ^ this organ consists of two sacs or glands at 
the inner side of the side-pieces (After-klappen) ; in the 9 the glands are 
situated between the terminal and sub-terminal segments, and are somewhat 
larger; in addition the female has two very small clavate filaments, the 
extrusion of which suddenly and strongly intensifies this odor. 
These " protective " odors are not further treated of; but he proceeds 
then to his second group of odor giving organs, which are found on the 
wings in the form of peculiarly shaped scales. 
He credits Baillif, a Frenchman, with the discovery of these peculiar 
scales ; but this author rather considered them as aberrations, and failed to 
recognize the fact that they were found in one sex only. Deschamps, in 
1835, discovered that these peculiar scales are found in the $ only, and he 
especially studied the situations of the scales and the method of their in- 
sertion into the wing membrane, evidently deeming them part of the 
tracheal system. 
Watson, in 1865, studied these same scales, and also came to the conclusion 
