Abstract
Many entomologists are acquainted with the spectacle of our common adult ladybeetles secured to the cocoon of their parasite and exposed on the trunks of trees, on weeds, grasses and other objects. Although this parasite has been studied by various men from the days of Dr. C. V. Riley to date, many phases of its cycle and habits have been unknown heretofore in this country. Its bionomics were therefore deserving of some attention and inasmuch as this same species is now believed to occur in some European countries, a comparison of its life history and habits here and there is of more than passing interest.

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