100 NEW YORK STATE MUSEUM 
the ground if one has good eyesight, though a powerful field glass 
is of material service. As noted elsewhere, egg masses of the apple 
tent caterpillar are unusually abundant in one section and it would 
not be surprising if investigations showed the same was true of 
the forest tent caterpillar. Apple trees in the vicinity of forests 
are particularly likely to be injured in case there is an outbreak. 
An early spraying with arsenate of lead, using at least 2 pounds 
to 50 gallons of water, would be advisable under such conditions 
for the purpose of destroying the hosts of young caterpillars before 
material injury results. 
Locust leaf miner (Chalepus dorsalis Thunb.). Seri- 
ous injury by this species was observed at Syosset and in that 
vicinity in August and September 1911, ithe beetles confining their 
operations largely to trees less than 30 feet high. An allied form, 
the rosy Hispa, C. nervosa Panz., was associated with and, 
in certain localities at least, more abundant than the parent of the 
locust leaf miner. The depredations of last season were continued 
this year, though in early July there was practically no injury by 
the beetles. Full-grown larvae of the locust leaf miner were then 
common in locust leaves and a few adults were observed. There 
were no signs of the allied C. nervosa. Early in August a 
totally different condition of affairs prevailed. The leaves of many 
of the larger trees, especially the apical ones, were brown, a con- 
dition due almost entirely to ithe feeding of the beetles. The latter 
were extremely abundant, two, four, six and even eight occurring 
on individual leaflets, the larger number being in the more sheltered 
situations. The small trees were more seriously affected than the 
larger ones, and from reports received subsequently it was evident 
that serious injury was inflicted. The extensive feeding at this 
season is evidently followed by the beetles going into hibernation, 
since there seems to be but one generation annually in this section. 
A more detailed account of this insect is given in our preceding 
report, New York State Museum Bulletin 155, pages 59-63. 
Serious injury by this insect was also recorded at Locust Valley 
by the Rev. William M. Cook. 
It is evident from observation of local conditions that thorough 
spraying with an arsenate of lead the latter part of July or early 
in August, at the time the beetles begin feeding upon the foliage, 
would result in protecting the trees from serious injury. This 
treatment can be advised only for the more highly prized trees on 
lawns or possibly along roadsides. 
