20 
Journal New York Entomological Society. 
[Vol. IV. 
The occurrence in the (Edipodinae of stridulation when at rest 
seems to have been entirely overlooked in late years, though observed by 
Yersin in CEd. fas data. Among the Acridinse Caloptenus italicus and 
Melanoplus femur-rubrum have been observed by Yersin and Scudder 
respectively to perform the stridulatory movements, though no sound 
was noted in either case. Yersin was disposed to believe that all locusts 
provided with well-developed wing-covers execute such movements, 
whether accompanied by sound or not. And it is not unlikely that 
sound is often produced too faint or fine for our ears to perceive. 
Nothing is known of stridulation in the Tettiginae, but it seems 
possible that it may occur in the same manner, i. e., by friction of the 
hind thighs on the side of the pronotal process or anterior edge of the 
wing which in this group take the place of the wing-covers. In the 
Eremobinae both sexes are said by Saussure to be often provided with 
special musical apparatus of two kinds, one used at rest and one in 
flight and both differing from those here mentioned. 
- + - 
BOTH SIDES OF BUTTERFLIES. 
By A. P. Morse, Wellesley, Mass. 
Every collector of butterflies and every student of variation in 
these insects is interested in methods whereby both surfaces of the wings 
of his favorites can be studied with a minimum amount of labor and in¬ 
convenience. Book-boxes, so-called, with glass top and bottom and 
cork gummed to the glass, answer very well in a permanent collection, 
but for one which is receiving additions and to whose owner expense is 
an item to be closely considered, so that an entire case or cases cannot 
be given up to a species, some method is necessary which will more 
readily permit of rearrangement when desired. With this end in view 
I several years ago designed the following plan, which is here presented 
in the hope that it will be of interest or use to others. While metal 
strips filled with cork have been used for some time I believe that the 
method of rearrangement suggested is entirely novel. 
The cases for which the plan was designed are of the standard 
museum pattern, i6x 19x3 inches outside, 15 x 18 inside measurement, 
the top and bottom of glass, the sides of wood joined by tongue and 
groove, the tongue being either of wood or metal. The plan, however, 
is applicable to almost any form or size of case preferred. Aside from 
