American species of the genus Sceliphron klug: the Spruce Gall louse (\u3cem\u3eChermes abietis\u3c/em\u3e L.) ; the host of Ablerus clisiocampae Ashmead
The first paper is a systematic treatront of the Arerican species of the genus Scellihron Klug. The first part of the paper is devoted to a detailed study of the external anatomy and male genitalia, followed by tables showing the position of this genus in the superfarrily Fihecoidea. This in turn is followed by a key to the Arerican species included in the genua, and redescriptiors of the different species
