e236. 
with a known concentration of lead arsenate and the number of gallons 
and pounds per acre used was recorded. The amount of spray deposited 
on the sround was estimated from quantitative analyses of squares of 
absorbent paper a had been placed at intervals beneath the trees 
before sprayine. btracting this amount from the amount of spray 
applied save the eteonee on the foliage. after s.raying, collections 
of leaves were taken from the top», middle, and lower branches of a 
number of trees and by quantitative analyses the amount of snray mate- 
rial on a certain area of foliage was determined. By dividing the 
estimated amount of spray material on all the foliage in the plot by 
that which the analyses snowed was present on a known area of foliage, 
an estimate of the total area of foliaze in the plot was arrived at. 
Liberation of parasites in 1935.--A summary concerning parasites 
liberated by the Melrcs se Highlands, Mass., laboratory during 1933 
shows that from material received from W. F. Sellers of the Budapest, 
Hungary, sublaboratory, a total of approximately 324,000 adults, be- 
longing to 19 species, were put out by members of the laboratory ‘staff 
or cooperating State ofardrais in infestations of the European pine 
shoot moth, larch case bearer (Coleophora laricelia Hbn.), satin moth 
(Stilpnotia salicis L.), gipsy moth (Porthetria disper L.), elm leaf 
beetle —— xXanthonelaena Schr.), and a birch jeaf-mining 
sawfly, Pavilotoma nemorate Fall. Most of these parasites were liber- 
ated in New 1 Risin id and New York, but egg parasites of the elm leaf 
beetle were sent tu other States, including California, and satin moth 
parasites to the State of Washington. Two additicnal species of intro- 
duced parasites established in New England were also sent to Washington, 
one to be liberated in areas infested by the satin moth and the other 
in similar situations and in territory infested with the pandora moth 
(Coloradia pandora Bleke). adults of the introduced predacious bee- 
tle Calosoma sycophanta L. were sent to the same State for liberation 
in areas where the hemlock spanworm (Ellopia fiscellaria Guen.) was 
abundant. Jt is not known whether the species sent will be able to 
sustain themselves in the hemlock looper and pandora moth-infastations, 
Canada covuperates in po Jno tn control.-—During the summer of 
1933 two members of the staff of the Be elleville, Ontario, parasite 
laboratory of the Hidcusthanecadl ina et »f the Canadian Dep,artment of 
Agriculture were in New ee ag for the purpose of obtaining, for 
shipment to infested areas in Canada, three svecies cof paresites that 
attack the satin noth. nase: Svecies have all been introduced from 
Euro ,e and established in New Fugland oy the Bureau of Entomology 
through the Melrose Highlands Aner awe vhere the representatives 
of the Canadian Department of ag riculture made their headquarters dur- 
ing the summer. They were able: to nake satisfactory shipments of the 
desired sarasites. 
