PAKASITKS OF OIPSY-MOTII PITT.. 
247 
ton' as could bo expected. The collections of nests from areas II and 
1 1 1 on the map I PL XXII) produced the parasite in abundance, and in 
area I, throughout which it was found the winter before, it was very 
much more abundant, as will be seen by reference to the tabulated 
summary of the results of the work for the winter in Table X. 
Table X. — Monodontomerus a r< iu as distributed oxer its area of dispersion. 1 
Section. 
Year. 
Number 
of brown- 
tail MSta 
collected. 
Number 
of Mono- 
donto- 
merus 
recovered. 
Monodon- 
tamerm 
per 1 .000 
bmwn- 
tail Deals, 
Beetlon. 
Year. 
Number 
of brown- 
tail Ile-ts 
collected. 
Number 
of Mono- 
don to- 
merns 
recovered. 
Monodon- 
tomeroa 
per 1 .000 
brown- 
tail nests. 
1908 
B, "7 1 
39 
6 
4 
1910 
1 . e;«is 
234 
137 
1 1 
1909 
2.200 
70s 
tn 
5 
1910 
701 
215 
305 
1910 
1,508 
495 
328 
6 
1910 
2,836 
521 
183 
l'.MIS 
1909 
947 


1910 
1,050 
260 
246 
2 
1.107 
124 
112 
8 
1910 
555 
86 
151 
1910 
700 
1VJ 
260 
9 
1910 
S25 
538 
652 
/ 1909 
770 
34 
4«.» 
10 
1910 
500 
1 
2 
3 
\ 1910 
200 
13 
50 
11 
1910 
1,600 
95 
59 
' Refer to the map ( I'l. XXII) for the area included in each section. 
Tahi.k IIkpi:kskntin<; tiik Rump Mi i.tiim.ic vtk >n i.k MmVudhxtomeki-s i.v the Field. 
Brown-tail 
nests col- 
lected. 
Monodon- 
tomerus 
recovered. 
Monodon- 
tonierus 
per 1 ,(XH> 
brown-tail 
nests. 
1,927 
960 
168 
190 
87 
199 
In HUD a fairly sat i>faet <>ry number of the parasites was reared 
from collections of br<>wn-tail moth cecoons made in the field, but 
when the gipsy-moth pup» were examined in the field as in 1909, 
scarcely if any more were found to be parasitized. This was any- 
thing but encouraging, because it had been expected that parasitism 
would amount to at least 1 per cent, if the rate of increase which had 
prevailed up to 1909 had continued. It appeared that the Monodon- 
tomerus was either inclined to pass over the gipsy-moth pupae in 
favor of other hosts, or else that its rate of increase had received a 
sudden check before it was sufficiently abundant to become of aid in 
decontrol of the moth. As before, that winter's work was anticipated 
with interest since its results would be more directly comparable with 
those of the year before than was that summer's work. 
The collections of winter webs were first made in the territory 
included within the range of the parasite in the winter of 1909-10 
(areas I, II, and III), and the fact soon became manifest that instead 
of increasing it had actually decreased in abundance throughout that 
territory in the course of the year. It was inexplicable, in view of the 
unlimited opportunities for increase, and it was, to say the least, 
discouraging. 
