Hoplisus gracilis, n. sp.

♀. Length 10 mm. Black, clothed with an appressed brown pubescence as in Hoplisus phaleratus (Gorytes phaleratus Say) ; face with a very short silvery pile. Face, stripe between antennæ, anterior and posterior orbits, clypeus, labrum and mandibles (except the piceous tips), palpi, coxæ, trochanters and femora of anterior legs anteriorly, spot on intermediate coxæ, posterior margin of collar, a small and a large spot beneath anterior wings, broad bands on scutellum and postscutellum, large ovate spot on each side of metathorax (irregular and tinged with ferruginous within), broad band at apex of first segment of abdomen, sharply emarginate and bordered with ferruginous anteriorly, interrupted band at apex of second segment, small spot on each side of third segment and line on each side of second ventral segment, all pale yellow.