. An annotated list of the important North American forest insects. Forest insects. 20 BULLETIISr 1182, U. S. DEPARTMENT OF States. Furthermore, the species of pines represented above are from sufficiently different sections of the country to make available a possible host in most of our pine-growing regions and in such a variety of climates that some of them must be favorable for the insect's development. DISTRIBUTION IN THE UNITED STATES. Diprion simile is known to occur in nurseries in Connecti- cut, New York, Penn- sylvania, and New Jersey. Specimens have been received from M
. An annotated list of the important North American forest insects. Forest insects. 20 BULLETIISr 1182, U. S. DEPARTMENT OF States. Furthermore, the species of pines represented above are from sufficiently different sections of the country to make available a possible host in most of our pine-growing regions and in such a variety of climates that some of them must be favorable for the insect's development. DISTRIBUTION IN THE UNITED STATES. Diprion simile is known to occur in nurseries in Connecti- cut, New York, Penn- sylvania, and New Jersey. Specimens have been received from Massachusetts, and the species is re- corded from Indi- ana.^^ The history of the sawfly in the United States suggests that it was introduced with imported nur- sery stock, a view which is supported by the fact that in Connecticut, New Jersey, and Massa- chusetts it has been intercepted at quarantine inspection ports. The following list gives the localities from which the species is recorded (see also Fig. 8): Connecticut: Derby, Greenwich, Hartford, New Canaan, and New Haven.'' Indiana. Massachusetts. New Jersey: Elizabeth, Rutherford, and South Orange.** New York: Flushing, L. I. Pennsylvania: Chestnut Hill '^ and ; ECONOMIC IMPORTANCE. The imported pine sawfly is to be regarded as an extremely danger- ous visitor in the United States, because in Europe, where it is asso- ciated with Diprion pini L., the two are responsible for an immense amount of damage. D. pini has usually been considered the chief cause of this injury, but the two species are so closely allied ^* and so frequently confused that the presence of D. simile in this country must be regarded with apprehension. In Europe D. pini ^^ is accred- ited with serious damage to pine in southwestern Russia, in 1914 de- foliating rnany acres of pine in the districts of Achtyr and Izium; in Germany, in Prussia, and particularly in Brandenburg and Silesia, in " Britton, W. E., and Zappe, M. P. Op. cit., p.
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