4 BULLETIN 352, U. S. DEPARTMENT OF AGRICULTURE. 
restricted localities, was generally destructive throughout two com- 
paratively large regions; the one, in the Appalachian region, involving 
the greater part of New York, Pennsylvania, and northern West 
Virginia; the other in the northern part of lower Michigan, espe- 
cially in the Grand Traverse region, where cherry growing is very 
extensive. In regard to the latter region Prof. R. H. Pettit, of the 
Michigan Agricultural College, writes (in litt.) that during the period 
of destructiveness by this beetle nearly every mail brought com- 
plaints. No complaints were received by the Bureau of Entomology 
from the territory intervening between these two regions. One of 
the writers, on June 17 and 18, traveled by trolley through Ohio from 
Sandusky to Ashtabula, stopping at a number of points between, and 
no injury by these beetles was noted. 
The majority of complaints came in June. However, the beetle 
was reported from Jamestown, N. Y., as early as May 12, and from 
Williamsport, Pa., May 21. The general migration to cultivated 
food plants in northwestern New York and Pennsylvania did not 
occur until the week of June 7. Farther south, in West Virginia, it 
occurred about the same time, the first report having been sent 
June 9. 
THE 1915 INVASION OF THE LAKE ERIE GRAPE BELT. 
The beetles appeared in the vicinity of North East, Pa., on June 7, 
literally covering the leaves of the trees attacked. Early in the 
morning their advent attracted the attention of fruit growers living 
3 or 4 miles south of Lake Erie, and by noon they were found in great 
numbers in orchards near the lake. After this first day of migration 
the increase was comparatively small, and no increase at all was 
noticeable in the vicinity at large after June $, although there was 
some local shifting of numbers. 
During the first few days of the migration stories told by fishermen 
of the abundance of the beetle on the lake were current; how pieces 
of wood floating on the water had been covered with them; how they 
had crowded on black buoys until the color of the buoys had been 
changed to red; and how the water itself had been full of them. But 
even after giving these stories the full discount that is generally 
accorded to stories of like origin, the fact still remains that the migra- 
tion of great numbers of beetles extended for some distance over the 
lake. Dead beetles were found in considerable numbers on two of 
the lake beaches by one of the writers on June 10, when a strong 
north wind was blowing, and it was reported that they had-been 
washed up in windrows. The occurrence of these beetles in the 
lake gave rise to the opinion that they had come from Canada. 
The actual source of the beetles was to the south of the grape belt, 
from cut-over forest land grown over by pin cherry. The preceding 
Ee lle 
