222 
PARASITES OF GIPSY AND BROWN-TAIL MOTHS. 
conditions, since the tussock moth is rare in the country in eastern 
Massachusetts, and while it was expected that Compsilura would 
eventually be recovered as a parasite of this host, it was hardly 
expected that it would become of importance as a parasite so soon 
as 1010, or, for that matter, that it would become of importance as a 
parasite in cities at any time. 
TOWA/S WHERE COMPS/LC/RA COA/C/A/A/ATA 
was foc/a/o paras/ r/c o/v broia/a/-ta/l /a/ /sos 
V/XA TOWNS WHERE COMP- 
X//// *S/LURA COA/C/A/A/ATA WAS 
TOWA/S WHERE COMPS/LURA 
COA/C/A/A/ATA WAS EOOA/D PARA 
FOUA/D PARAS/T/C O/V BROWA/-TA/L //V 
/3/Q. 
S/T/C OA/P/ER/S /A/ FALL OF/9/0. 
Y\q, 42.— Map showing distribution of Compsilura concinnata in Massachusetts. (Original.) 
The only one of the localities chosen for the tussock-moth col- 
lections which was within the limits of Compsilura's distribution 
so far as known when the work was instituted was in the city of 
Lynn, Mass., and from this a total of 110 caterpillars was collected 
on July 18, 1910. On July 29 the tray in which they were contained 
was carefully examined. Thirteen of the tussock-moth caterpillars 
