A new species of the Staphylinid genus Trygaeus

Niger, nitidus, convexus, antennarum apice ferrugineo, tarsis rufis; prothorace inaequali, dense fortiterque punctato; elytris profunde sulcatis, interstitiis convexis, parum latis. — Long. 6 millim. Head with the upper surface somewhat uneven, rather closely and finely, but irregularly, punctate, scarcely shining. Antennae reaching backwards slightly beyond the base of the thorax; piceous-black, at the base with five joints free from sensitive pubescence and therefore somewhat shining; the joints from this to the extremity are somewhat, broader, the penultimate joint being scarcely so long as broad, they are densely pubescent, and the terminal joint — as also the apex of that preceding it — is ferruginous. The thorax is strongly transverse, and very convex in the transverse direction; it is strongly narrowed in front, the sides are somewhat irregular in outline, and are a little rounded and very slightly contracted behind near the hind angles; the base is deeply sinuate on each side of the middle, and also less deeply emarginate in the middle in front of the scutellum; the surface is uneven, bearing several rather indefinite impressions, it is glabrous, and is rendered rough by a deep, coarse punctuation which is somewhat irregularly distributed, the punctures being in some places nearly confluent: the lateral raised margin ceases entirely at about onethird of the length in front of the base. The scutellum is large and quite smooth and shining. The elytra are scarcely twice as long as the thorax; they are very deeply sulcate, the interstices being strongly elevated and rather narrow, the grooves are somewhat indistinctly crenate. The legs are piceous-black, the sulcation of the tibiae is very distinct