EGG PARASITES OF THE GIPSY MOTH. 175 
at the time when they must be placed, if placed to advantage, more 
could easily be collected. | 
The rate of increase in the field, as indicated by the work which has 
been done, is not excessive, but probably amounts to something like 
sixfold per year. The extreme limit of dispersion discernible in 1909 
was not quite half that of the extreme for two years, as indicated in 
the diagram. It is possible that it may become more rapid as time 
goes on, and it is rather expected that a high wind, at an opportune 
time, will assist materially in the dispersion of the species. Should it 
not, it will require a very long time for it to become generally estab- 
lished everywhere through the infested area. Even though there 
were a colony planted to each square mile, something like 16 years 
would elapse before all of them met and fused, unless the present rate 
of dispersion were accelerated. 7 
It has been pretty definitely proved of Schedius that it can only 
attack the uppermost layer of eggs in each mass, and the same is. 
equally well proved in the case of Anastatus. Since there are two 
layers of eggs, and usually three in all but the very smallest masses, it 
is evident that the usefulness of Anastatus is still further reduced 
through its physical limitations. The figures of percentages given in 
the diagrams probably represent about the maximum which can ever 
be expected. None the less, this means a distinct benefit, and with 
all its faults, Anastatus stands high in favor at the present time. 
In its distribution abroad, Anastatus is, as might be expected, of 
quite local occurrence. It has been received from about half of the 
localities represented by the European importations, and in very 
variable abundance. The numbers found in five lots of what was 
estimated as 1,000 egg masses each, received from five different locali- 
ties in Hungary through Prof. Jablonowski in the winter of 1908-9, 
is rather typical in this respect. As estimated through careful exam- 
ination and counts, these numbers were as follows: 
Tebdeaiies| Number of | 
Number. Locality. Anastatus. 
S017 = 2: PIR ROMNES)) 320 24-20. oe ee ho te 34, 000 
BOLGs<-. J Bustyhaza (Maramoros).............. 0 
3019-323 bruset (CM aramoros) 2.2.2 eco! ee 208 
eae 2 Porras (Panes) ae fe4 eS 6,099 | 
5 re pistarobecs- (Temes): .. 3)... hisses 39,000 | 
MM Si ee nt tk Peasy 79,307 
In Japan it is also unevenly distributed. The most which were 
received from that country were in a lot of eggs from Fukuoka Ken, 
received during the same winter as those above mentioned from Hun- 
gary. It is not at all common from the vicinity of Tokyo, and while 
itis present in nearly every lot of Japanese eggs which has been received, 
in every instance but one (the shipment above mentioned) the number 
