33 ; 
festing the roots of grasses during the summer with one occurring on 
the leaves of dogwood during autumn. The full import of this connee- 
tion from the economic stand-point can not be known till it is determined 
how many species of grasses are affected by the root form and to what 
extent the migration to dogwood exposes it to attack. If its occurrence 
is confined to the annual grasses (and it seems to occur only on these), 
its importance to the farmer will be much less than if itis found to work 
also on perennial species. 
A brief statement of the connection between these two forms was 
published in Insect LIFE (Vol. II, pp. 108-9), but a fuller account, with 
details of observations, is proper at this time. 
My attention was first called to this species on September 15, when I 
noticed the air was filled with small insects, which on capture were 
found to be plant-lice of the genus Schizoneura. Their immense num- 
bers, filling the air as far as could be seen in all directions, naturally 
excited my interest, and I walked some distance in the direction from 
which they seemed mainly to come (which was with the wind), but 
without locating their origin, except to observe that they were resting 
on all sorts of plants and were very plentiful along roads and paths 
where fox-tail and other grasses were plenty. Upon examination I de- 
termined the specimens gathered to be Schizoneura corni Fab., speci- 
mens of which I had gathered a year or two ago from dogwood. It 
seemed difficult, however, to account for such an immense swarm of them 
when dogwood is not especially abundant in the immediate vicinity and 
had not been observed as infested with aphids. In looking over de- 
scriptions of allied species I was struck by the close agreement with 
descriptions of Schizoneura panicola Thos., and, following this lead, I 
examined the roots of Setaria and Panicum on September 16, when the 
winged forms were again numerous in the air. My search was almost 
immediately rewarded with the finding of numerous wingless Schizo- 
neure, aud among them some which showed wing-pads aud two with wings 
partly expanded. These were compared carefully with winged corni 
found flying ard also with corni from dogwood, and showed such close 
agreement that I felt it important to follow the matter up. One of the 
specimens, with wings partly developed, was mounted in balsam for 
future reference; the others, on grass roots, were put in breeding jars. 
Their subsequent history will be stated later on. 
Examinations in the field on the 18th showed lice still somewhat 
plenty on grass roots, though the Setaria examined failed to show them 
in very greatabundance. Examinations the same day, of the dogwood 
in the timber near, showed on the very first bush noticed numbers of 
the winged (pseudogyne) individuals, and with them numbers of small 
larve evidently just extruded. The colonies accompanying each 
pseudogyne contained from one to a number of larvae, but none of these 
could have been more than a day or two old, all very small, scarcely 
larger than when first born, In no case could I find a leaf on any of 
23479—No, 22——3 
