Leconte and Horn, in their “Classification,” say of this beetle: “It is of such extreme rarity as to have been by but few entomologists.” It was with considerable interest, therefore, that I captured my first specimen one March afternoon in 1894. I came upon Æ. debilis on the under side of a stone. From Leconte'e description I felt prety sure that my identification was correct, and it was subsequently confirmed by Dr.Fletcher, or Ottawa. Leconte says the beetle is black, but he had probably seen only dried specimens. Freshly-taken specimens show a distinctly green tinge. The insect is about .15inch long, and in general shape suggests a small carabid.