60 ANNUAL REPOBTfl OF DEPAOT II KN I OF AGBIOULTUBB, 1935 
Ing February and March for colonization in that State. Small consignment! 
of Bathyplectea oorvina Thorns, and Tetraitichut \ncertn 
which are larval parasius, have also been made; 
HESSIAN FLY PARASITES 
Small shipments of Platyg aster pleuron Walk, and TrichaoU remulut v 
were made during the spring of 1!K)5. Both of those are minor parasil 
the hessian fly in Europe. 
EUROPEAN PINE SHOOT MOTH PARASITES 
Bulk collections of shoots infested with the pine shoot moth were made In 
Austria during May and June, and these were forwarded to the United S 
for rearing out tin* parasites. Examination of -amnios indicates that this 
material contains sufficient numbers of nine species of parasites for coloniza- 
tion. The most important <>f these are Copidosoma genioulatum Dal., / 
dubia Fall., and T( trust icJtus turionum lit;:. 
LARCH CASE BEARER PARASITES 
During March a total of 200,000 hibernating cases were collected in Austria 
and forwarded to the United, states. Representative samples reveal 
parasitization of 41 percent. The greater portion of these were Chrysot 
laricincllae Ilatz. 
BIRCH LEAF MINER PARASITES 
Field collection of leaf mines of the birch leaf miner was condo 
September 1934 in Austria, and a total of 32,000 of these shipped to the I 
States. The dominant parasites were Phanomeris phyllotomae Blues, and 
several species of Chalcidoidea. Three thousand immature stages of U 
and 11,300 of the latter were forwarded, in addition to the quamin 
cells mentioned. 
ELM LEAF BEETLE PARASITES 
Insectary tests indicate that Tetrastichus xanthomelaenae Marchal, 
parasite of the elm leaf beetle, passes the winter in the adult si 
may explain the difficulty of securing establishment in the United states 
Several shipments of reared and field-collected material were forwarded during 
May and June. Field parasitization in southern Prance attained a ma\ 
percent in 1935. Eight thousand hibernating elm leaf beetles 
warded to the United States in .March, and dissections of samp] 
parasitization of 9.5 percent by the tachinid fly Anachaetoprts tiitiduU 
This parasite attacks both the adult beetle and the larva. 
COOPERATION WITH FOREIGN ORGANIZATIONS 
informal cooperative work- lias been conducted dm' ig the year with a du 
of foreign organizations. The Canadian Department of Agriculture arra 
for the collection of 250,000 corn borer larvae in Japan, and assistance 
given by this Bureau in assembling the material and in rearing 
parasites at the Moorestown laboratory, a shipment of 
[arch Bawfly collected in Japan by this division, with funds provided '■ 
Canadian Department, was forwarded t<» Canada in December 
were heavily parasitized by an undetermined tachinid fly. 
in early June 1935 the Canadian Department of \ l two 
shipments comprising 11,000 adults of Collyric caltitrator <;-.i\. !or lolonisa* 
tion in the sections of Ohio and Pennsylvania Infested with the black graln- 
Btem s.iwiiy. 
Shipme ts or parasites have been forwarded during the year to the cow 
d in table 19 
