Microctonus Agilis.N. sp–♂. Piceous, shining; clypeus and mandibles testaceous; palpi whitish; antennæ longer than head and thorax, slender, fuscous, basal third pale; pleura beneath, rufo-piceous; tegulæ whitish; wings hyaline, iridescent; nervures and stigma fuscous, the latter large, lanceolate; marginal cell longer than stigma, lanceolate; legs, ineluding coxæ, pale honey-yellow, extreme tips of posterior tibiæ dusky; abdomen smooth, shining, depressed, first segment tinged with rufo-piceous, gradually dilated to apex. Length .10 inch.