454 
The Ohio Naturalist. 
[Vol. VI, No. 4, 
{Vitis vulpina L). The webs were abundant everywhere upon 
the choke-cherry and the common wild black cherry, some trees 
of the latter kind having nearly half of their foliage destroyed. 
Willows were also nearly always populated bv a few or many 
broods. The few walnut trees were literally defoliated, and this 
will be the subject of the next topic. Elm, box-wood and 
hackberry were frequently infested but never to the same 
extent as the previously named trees. In only two instances 
did I observe the worms feeding upon the wild grape, and then 
only when the grape leaves grew in among the leaves of willow 
and choke-cherry. I did not observe a single instance of the 
worms feeding upon the poplars at the Point. This is quite at 
variance with other observations in which poplars of all kinds 
were generally much infested. Thus, in Riley’s report upon 
the Webworm in Washington in bS8() (“Our Shade Trees and 
Their Insect Defoliators”) Populus balsamifera L) and P. trem- 
iiloides Mx. are named among the trees that .suffered most. Both 
these poplars occur at Cedar Point but no webs were observed 
upon them. 
Following I give the first five trees named in Riley’s list of 
lOS food plants for Washington. These are arranged according 
to the damage suffered. Xegiindo aceroides Moench (Box Elder), 
Populus alba L (European White Poplar), P. monilijera Alton 
(Cottonwood), P. balsamifera L (Balsam Poplar). 
The same report further states that poplars, cottonwoods 
and the ranker growing willows were the principal subjects of 
attack in ISSG in New England. 
Of the species of trees attacked at Cedar Point, four, walnut, 
wild black cherry, choke-cherry and willow appeared to be the 
favorite food of the worms, and these are respectively 41, 7o 
and 14, in Riley’s list. (The common wild cherry is not named 
in his list, and its place among the above figures is indicated by 
a question mark.) Again, of all the species of plants named by 
Riley forty-two genera and about twenty-six species are found 
at Cedar Point ; but of these only eight were observed to be used 
as food by the worms. 
Throughout the State generally, so far as my limited observa- 
tions extend, and from a few other reports, the common wild 
black cherry is the tree most generally attacked; but walnut, 
elm, hickorv, pear, apple, sugar and silver maple, all suffer more 
or less. Of these, walnuts, when attacked suffer most, as the 
following topic will show; and Mr. Cotton, Assistant Inspector 
of Orchards and Nurseries, has informed me of similar conditions 
in other parts of the State. 
The following observation is interesting as it shows the dis- 
crimination with which the female moth selects the food plants 
upon which she deposits her eggs. One day I observed a web 
