10 
BULLETIN 204, U. S. DEPARTMENT OF AGRICULTURE. 
Compsilura is present in more localities in Maine, but we have been 
unable to secure definite records to that effect. The followine: table 
is interesting, as it shows the general rate of dispersion of this para- 
site. The spread recorded is based on distance from Melrose High- 
lands, Mass., and is mostly due to natural spread, although a few 
small colonies have been liberated outside of the area where the 
species was known to occur in 19 1 3-. 
Table I. — Dispersion of Compsilura coneinnata. Distaiice recovered from Melrose 
Highlands, Mass. 
1913 
1914 
From Melrose Highlands: 
North 
Miles. 
75 
100 
50 
40 
50 
70 
Miles. 
100 
130 
50 
55 
65 
80 
South 
Southwest 
West 
Northwest 
It is undoubtedly true that this species is now present over an 
area which would be represented by connecting the points indicated 
by the directions and distances given in the table for 1914. (PL VI.) 
Four thousand five hundred and sixty-five Compsilura were liber- 
ated in 10 new towns in 1913 and 10,000 were placed in 21 new 
towns in 1914, as follows: Eight in Xew Hampshire, 5 in Vermont, 
2 in Massachusetts, 2 in Rhode Island, 3 in Connecticut, and 1 colony 
was forwarded to a substation of the Bureau of Entomology at 
Koehler. X. Mex., in order to test the value of this species as an 
enenry of the range caterpillar (Hemileuca oliviae Ckll.), an insect 
which is causing enormous damage to the grazing lands in that State. 
In addition to the number of specimens of this species colonized in 
1914, about 5,000 were secured by Mr. McLaine and shipped to New 
Brunswick; about 3,000 were secured by Mr. R. S. Ferguson, assist- 
ant in the moth department of the State of Maine, who, with several 
assistants, were collecting for the purpose of establishing colonies in 
that State, and over 2,500 were collected and colonized by Prof. 
O' Kane's assistants in Xew Hampshire. 
Three hundred and sixty-five sample collections of gipsy-moth 
larvae which were secured during the summer of 1914 from scattered 
localities hi Maine, Xew Hampshire, Massachusetts, and Rhode 
Island, consisted of over 99,000 caterpillars. This material required 
the use of over 500 rearing trays at the laboratory and the constant 
attention of several assistants to feed the larvae in each tray and 
record the parasitism, mortality, and other data. 
Based on 25 collections of gipsy-moth larvae taken at widely scat- 
tered points in the gipsy-moth-infested area and aggregating 46,000 
