42 
THE DISPERSION OF THE GIPSY MOTH. 
that infertile egg clusters will result in case any are deposited. Cases 
are on record where a male gipsy moth has been attracted half a mile 
by a female. This factor probably assists the species in becoming 
established at distant points. 
RELATION OF SCOUTING RECORDS TO WIND DISPERSION. 
The records which have accumulated showing the number of egg 
clusters found and treated by scouts in the various towns, as well as 
the reports of the work done by local superintendents, have been 
examined for the purpose of determining whether information could 
be secured that would have any bearing on the dispersion of the 
insect. As a result of the examinations it appears impossible to give 
data covering the entire territory, since the records are incomplete 
in many cases and they have been kept in various ways so as to make 
a comparison of little value. The plan has been to select several 
towns and cities (see fig. 4) where complete records were obtained. 
The geographical locations of these are typical, so that the results 
will serve to illustrate the relation of wind to infestation as found 
by scouts. It should be remembered that no woodland area is in- 
cluded in the records cited, for only roadsides, orchards, and the 
grounds about residences were examined. 
In order to check this data a complete scout has been made of 
several towns by employees of the Bureau of Entomology, United 
States Department of Agriculture, working under the direction of 
Mr. Kogers. This included a careful examination of the wooded 
areas as well as the roadside trees. 
RECORDS OF DISPERSION OF THE GIPSY MOTH SECURED FROM 
REPORTS OF SCOUTING IN SEVERAL SELECTED CITIES. 
For the purpose of making a comparison showing the rapidity of 
infestation in different localities (fig. 4) the cities of Brockton and 
Worcester, Mass., and Nashua, Manchester, Concord, and Portsmouth, 
X. H., are given in Table VI. 
Table VI. — Record of egg clusters of the gipsy moth found in certain cities of 
Neiv England during the years 1905-11. 
Cities. 
1905-6 
1906-7 
1907-8 
1908-9 
1909-10 
24 

127 

283 
44 
3,101 
32 
1,575 
31 



2 
9 
2 

175 
176 
53 
( 3 ) 
802 
910 
456 
93 
9,417 
16, 759 
( 2 ) 
1,855 
72.294 
1910-11 
Massachusetts: 
Brockton 
Worcester 
New Hampshire: 
Nashua 
Manchester 
Concord 
Portsmouth 
1 Estimated 
5.600 
275 
117,607 
i 16, 598 
4,419 
i 72, 000 
2 No record. 
3 1 pupa. 
