3 ~ J% & 6 
115. 
ACHENIUM DEPRESSUM. 
Order Coleoptera. Fam. Staphylinidae Lat Leach . 
Type o/* Gercws Lathrobium depressum Grav. 
Achenium Leach., Samouelle. Lathrobium Grav. Staphylinus Linn., 
Fab. 
Antennce long, inserted before the eyes close to the base of the 
mandibles, filiform, pilose, 1 J -jointed, basal joint the longest, 
2nd the shortest, the remainder clavate, of nearly equal length, 
terminal joint conical (fig. 6). 
Labrum elongated, bilobed, lobes ciliated internally, and pro- 
ducing a few long bristles at their apex ( 1 ) . 
Mandibles large, bent, acute with 2 teeth on the internal edge, 
the lower one being the smaller (2). 
Maxillce with the terminal lobe small, and membranous at the 
apex, both densely clothed with soft hair on the internal margin. 
Palpi 4-jointed, pilose, 1st joint small, 2nd and 3rd long clavate, 
4th small papillaeform (3). 
Mentum triangular, anterior portion membranous, truncated. 
Lip produced, forming a strong ciliated process on each side, and 
2 rounded membranous lobes in the middle. Palpi arising near 
the centre of the lip, 3-jointed, 1st joint rather small, 2nd sub- 
ovate robust, 3rd very slender (4). 
Depressed. Head obcordate. Eyes lateral minute. Neck cylindric 
distinct. Thorax ovate, truncated before, not concealing the contract- 
ed base of the alitrunk. Scutellum triangular. Coleoptra qua- 
drate. Wings small, not so long as the elytra. Abdomen margined. 
Legs robust. Thighs very robust , especially the anterior. Tibiae sim- 
ple, anterior slender, suddenly dilated towards the apex , ciliated and 
emarginate internally. Tarsi 5-jointed, terminal joint the longest, 
the 4 basal in the anterior pair , very much dilated, pubescent, ciliated 
beneath with jointed or glandular hairs. Claws slender simple (5, a 
foreleg). 
Depressum Grav. Coleop. Microp. p. 182. n. 6. 
Smooth, shining, pilose. Head and thorax polished, minutely 
and sparingly punctured, dark castaneous, the thorax having an 
obscure line down the centre. Scutellum black. Elytra bright 
ochraceous, black at the base, shaded into castaneous, lightly 
punctured somewhat in striae. Abdomen minutely punctured, 
pubescent, pilose towards the apex, black, anterior margins of 
segments and terminal joint fuscous -ferruginous. Antennae, 
mouth and legs bright ferruginous pilose. Palpi and tarsi ochra- 
ceous. 
Ohs. Specimens are generally less brilliant than the one figured, 
probably from their being immature. 
In the Author's and other Cabinets . 
