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FOREST INSECTS 
Salph C. Hall, Columbus, Ohio, reporting on investigations of the 
Locust borer (Cyllene robiniae Forst.), says: "A number of infested black 
locust trees were examined during the month to ascertain the development 
of the young larvae. By the latter part of the month the young larvae had 
eaten through the outer and inner bark and the majority of them had started 
to work in the wood. The unusually warm fall may have accounted for this 
unusual activity. One severely injured tree, 7 years of age, diameter 
breast height 1.4 inches, and 15 feet in height was very carefully examined 
for the presence of young locust borer larvae. This tree was found to con— 
tain 191 young larvae. They were distributed in the tree as follows: 
From the ground up to 2 1/2 feet, 149 larvae: from 2 1/2 feet up to 10 
feet, 43 larvae; and from 10 to 15 feet, no larvae. This tree was located 
in a young black locust stand that had been Severely injured during the 
past season and all indications point to severe injury this coming season." 
In the November Monthly Letter it was stated that rather large 
Shipments of birch leaves containing hibernation cells of the larvae 
of the leaf mining sawfly (Phyllotoma nemorata Fall.) had been received 
at Melrose Highlands from the Budapest, Hungary, sublaboratory. Additional 
material, collected in Freistadt, Austria, was received during November and 
was cared for by P. B. Dowden and D. L. Parker. The latter reports that 
in shipments received this month there were 907 normal cells of Phyllotoma, 
163 cells which had been cut from the leaves, 100 cells formed between 
two layers of paper, and 23 braconid parasites and one chalcid in the mines 
of Phyllotoma. All the material received this fall has been prepared for 
hibernation at the laboratory in various ways. Some is held dry, some 
upon peat moss over sand, and some on a Screening placed over peat moss 
and sand." 
An account of the collection of these infested leaves is reported 
by W. F. Sellers, Budapest, Austria, who says: "Collections of infested 
leaves of birch (mostly Bstula verrucosa) were made at Freistadt and 
Monichkirchen, Austria, to obtain material for shipment to America, 
This work was begun in September and finished in October. At Freistadt, 
29,458 leaves were collected on 24 widely separated moors. * * * three 
men scouted an area of about 860 square kilometers to locate the infes— 
tations, which were apt to be on two or three trees. The heavy infes— 
tations were found at altitudes between 630 meters and 950 meters. One 
worker collected as many as 1,978 infested leaves in a day. At Monich— 
kirchen 2,157 infested leaves were collected in a territory covering 300 
Square kilometers. Phyllotoma was scarce and trees bearing any consider— 
able number of infested leaves were rare." 
Commenting further on the parasitism of the pine tip moth (Rhya-— 
Gionia frustrana Comst.) by Campoplex frvstranae Cushman, L. G. Baum— 
hofer, Halsey, Nebr., says: "In a plantation of western yellow pine 

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