January, 1900. Natural History Notes. 
65 
In these gatherings I found that the butterflies preferred elm 
trees to any other for resting purposes. It is true I noticed a few 
on oak, maple and basswood trees. The reason that the elm trees 
received the preference is due, in my opinion, to the fact that its 
leaves offer the insect a firmer hold than do the leaves of the other 
trees. The elm leaf at this time of the year turns slightly up at the 
edges, thus giving the butterflies an opportunity to clasp the edges 
of the leaf, while in the leaves of the bass, oak and maple they are 
compelled to hold to the flat surface. In resting, these insects 
always chose the upper side of the leaf, and sit with their heads 
pointing towards the trunk of the tree or upwards, i. e., in a direc- 
tion opposite to the growth of the branch. I am unable to state 
w^hether the migratory flights are undertaken during the night or 
day, never having been fortunate enough to be an eye-witness. 
Mr. F. Rauterberg has informed me that he at one time saw a 
flock of these butterflies start, from the same locality wdiere my 
notes were made, and choose a southeasterly course across Lake 
Michigan. This was at dusk, so we may feel positive that that 
flock migrated under the cover of night ; other observers too have 
noted nocturnal flights of these insects. 
P. H. Dernehl. 
On the Occurrence of the Hawk Moth Argfeus Labruscae in 
Wisconsin. 
Although at home in Japan this insect has found its way to 
the United States, either by means of transportation, or possibly 
employing its extremely enduring powers of flight, it has managed 
to find its way hither unassisted. It is occasionally met with in 
the more southerly regions of the United States. In Wisconsin 
it is very rarely seen. I can enumerate but two specimens cap- 
tured in this state. One was taken in Sheboygan in 1893 and is 
now in the possession of Mr. F. Rauterberg. 
The writer was fortunate in capturing a second individual 
Sept. 5th, 1899. When taken it was very intent upon visiting the 
blossoms of various species of gourds, seemingly prefering these 
to all other flowers, of which there was a great varietv in the same 
garden. It was 7 130 p. m. when captured and quite dark. 
P. H. Dernehl. 
Depredations of the Cottony Maple Scale. 
The cottony maple scale, Piilvinaria innumerabilis, Rathv., 
whose annual presence by reason of its comparatively small num- 
bers has gone almost unnoticed for several seasons past, made its 
