729 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 1910, or, for that matter, that it would become of importance as a 
parasite in cities at any time. 
AN a\ 
NN \ 
3 
Se we 
ie) 
m 
S 
\N ro} 
w 
o 
WAYLAND 
AUAUTIUIIT TOWNS WHERE COMPSILURA CONMCINNVATA 
WAS FOUND PARASITIC OV BROWWN-TAIL 1 1909. 
4, TOWNS WHERE COMP- NI 7OWVS WHERE COMPSILURA 
Zs CONCIVNATA WAS SQ CONCINIVATA WAS FOUND PARA 
FOUND PARASITIC ay a IM SI7IC ON PIERIS IN FALL OF 19/0. 
Fic. 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 
