. The Canadian entomologist. Insects; Entomology. Ciuadtan mntomolaijbl Vol. XLIII. LONDON, SEPTEMBER, 1911. No. 9 ON COELOPISTHTA NEMATICIDA PACK., A CHALCID PARASIT1-: OF THE LARGE LARCH SAWFLY, LYG^ONEMATUS ERICHSONII HARTIG.* BY C. GORDON HEWITT, DSC, DOMINION ENTOMOLOGIST, OTTAWA. In the course of a study of the European and North American para- sites of the Large Larch Savvfly, LygcE07iematus erichsojiii Hartig, which was begun several years ago, observations have been made on the Hfe- history of this Chalcid parasite. Its abundance in the cocoons of L. erichsonii kept under observation
. The Canadian entomologist. Insects; Entomology. Ciuadtan mntomolaijbl Vol. XLIII. LONDON, SEPTEMBER, 1911. No. 9 ON COELOPISTHTA NEMATICIDA PACK., A CHALCID PARASIT1-: OF THE LARGE LARCH SAWFLY, LYG^ONEMATUS ERICHSONII HARTIG.* BY C. GORDON HEWITT, DSC, DOMINION ENTOMOLOGIST, OTTAWA. In the course of a study of the European and North American para- sites of the Large Larch Savvfly, LygcE07iematus erichsojiii Hartig, which was begun several years ago, observations have been made on the Hfe- history of this Chalcid parasite. Its abundance in the cocoons of L. erichsonii kept under observation would indicate that it is an important factor in the natural control of the sawfly in the Eastern States and Canada, and for this reason and also because hitherto it has been undescribed, the present account is written. Packardf first referred to this parasite in the account of his investiga- tions on Lygceonemaius erichsonii which were made immediately after the latter insect had been discovered as a forest pest in the United States and Canada. He says : "A number of cocoons sent us in 1SS2 by ^Vx. Atkins were found to be in every case tenanted by a minute chalcid parasite, belonging to the genus Fieromalus. If new it may be called Pteromahis nefnaticida (Plate XII, Fig. 8). About a hundred of these issued from the cocoons in the breeding-box during May, 1883. This parasite must, therefore, be a most destructive enemy of the larch ;' Beyond the figure of tlie parasite, which is given and again repro- duced with the above account in the Fifth Report of the L'nited States Entomological Commission (1S90), no further description is given. From the correspondence ])rinted in this account of the injuries of the sawtiy it would appear that Mr. Charles F. Atkins collected the aforementioned cocoons in Maine. No further description of this insect, so far as I am aware, has been published since Packard provisionally named it. *Contributicn3 from the Division of Entomology
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