During the summer of 1920 the writer was engaged in studying the bionomics of the Apple Sucker, Psyllia Mali, in Nova Scotia, and, having occasion to make numerous dissections, he was struck by the lack of literature dealing with the anatomy of any members of this family, particularly with regard to the internal organs. Investigation showed many interesting and unusual features in the morphology of the insect and so the entire anatomy was chosen as the subject for this thesis. The field is a wide one, and it has not been found possible to follow out all points in full detail in the time available, with only preserved material with which to work. If there appears to be a hesitancy and uncertainty in describing certain structures, it must be borne in mind that the body of this insect is only 2.5 m.m. long, so that the individual organs and sclerites are in most cases extremely minute, rendering the work of dissection very delicate and trying. The writer hopes to follow up those points which have only been lightly touched upon, extending the field of investigation to related species, with the object of producing a more complete and valuable piece of work.

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