32 
spots of this kind all gradations of withering could be found up to 
where the entire blade was withered or brown. Plenty of these insects 
were to be found even where the grass was comparatively dry, but that 
they preferred the more juicy grass was shown by their accumulation in 
shaded places or where the grass presented more vigorous aspect. 
They could be secured in abundance from patches where no other veg- 
etation occurred, and in the absence of other insects in numbers to 
cause the withering mentioned, there can be no question, I think, as to 
the serious nature of their attacks upon the grass. Even when they do 
not cause withering of grass they must draw seriously upon its vitality. 
I have thus far been unable to separate any definite broods. Adults 
occur during the entire year, and larvie, which may be quite certainly 
referred to this species, may be found associated with them during the 
most of the summer months. Larvee are perhaps most common during 
June and in August and September, but whether there are two broods 
or three, or an indefinite number depending only on the length of the 
season, | can not now say. It seems most probable, however, that 
breeding goes on irregularly all through the summer months, but that 
the adults of spring are represented by only two or three generations 
of progeny, and the’members of the latest broods survive the winter to 
begin the production of new generations in the spring. 
In connection with his description of the species, which was published 
in 1831, Say makes the remark that ‘‘ When in the larva state this 
Species is said to depredate on the roots of wheat. Several specimens 
were sent me by Professor Green in the year 1822, who received them 
from a farmer in Virginia.” 
Considering the wide distribution and great abundance of this species, 
it seems strange that it should have been so little studied or so rarely 
mentioned in works on injurious insects. 
The insect is somewhat less than a fourth of an inch long and appears 
grayish or yellowish gray, and about the most constant marking are two 
dots on the front of the head, two on prothorax, and two on scutellum. 
A form lighter than the typical examples but which seems to me only 
alight variety, has even these dots obscure or wanting. 
The larvee are light yellowish but seem to be subject to about as 
much variation as the adults. An extreme form of larvie, probably be- 
longing to this species, has dark margins to the prothorax and abdomen. 
Several other species of Jasside have been observed in grass, but as 
they are not as yet determined I omit further mention of them at this 
time. 
THE GRASS-ROOT PLANT-LOUSE ALIAS THE DOGWOOD PLANT-LOUSE. 
(Schizoneura corni Fab.) 
Probably the most interesting result of my season’s observations 
from a scientific stand-point, and it may be the most important econom- 
ically, is the determination of the identity of a form of plant-louse in- 
