3-)tZb 
107 . 
DIANOUS CGSRULESCENS. 
Order Coleoptera. Fam. Staphylinidae Lat Leaclu 
Type of the Genus Stenus coerulescens Gyll. 
Dianous Leach , Samouelle. Stenus Lat., Fab., Grav., Gyll. Sta- 
phylinus Linn., Fab. 
Antenna inserted behind the clypeus, between the eyes, subcla- 
vate, 1 1 -jointed, pilose at the base and pubescent towards the 
apex, basal joint thick ovate, 2nd smaller ovate, 3rd long, nearly 
linear, the 5 following decreasing in length and increasing in 
thickness, 9th and 1 0th turbinate, last conic (f. 6). 
Labrum transverse, sub-oval, slightly pilose (1). 
Mandibles long, transverse, curved, acute, dilated towards the 
base, with a single tooth on the internal edge near the apex (2). 
Maxilla small, terminated by 2 ciliated lobes, of which the su- 
perior one is the longer and more rigid. Palpi very long, pi- 
lose, 4-jointed, basal joint long clavate, 2nd longer clavate, 3rd 
nearly as long as the preceding united, terminated by a trans- 
parent papillose membrane rather than a 4th joint (3). 
Men turn quadrate. Palpi short, 2-jointed, the 3rd being obso- 
lete, 2nd oval, pilose. Lip not longer than broad, cordate, bi- 
lobed (4). 
Head large, subtrigonate. Eyes ovate, not very large but prominent. 
Neck distinct. Thorax elongate, cylindric-ovate , truncated, narrower 
than the head. Scutellum very minute. Coleoptra quadrangular, 
considerably broader than the head, emarginate at the posterior angles. 
Wings 2. Abdomen convex, terminated by 2 naked seta, more di- 
stant and incurved in the males (10). Legs rather long and slender. 
Tibiae simple. Tarsi 5 -jointed, anterior somewhat dilated in the male, 
4th joint slightly bilobed. Claws simple (5, fore leg of male). 
Ccerulescens Gyll. Ins. Suec. t. 1. pars 2. p. 463. n. 1. — rugulosus 
Leach's MSS. 
Cyaneous, punctured, pubescent. Head cyaneous, irregularly 
punctured, with 2 longitudinal impressions extending from the 
base of the antennae nearly to the neck. Eyes black. Thorax 
cyaneous, coarsely punctured. Elytra covering half the abdomen, 
coarsely punctured, anterior angles rounded, cyaneous, with a 
pure ochraceous spot behind the middle. Abdomen cyaneous, 
inclining to purple, not so deeply punctured as the head, apex 
in the female ferruginous. Antennae blackish, 3 terminal joints 
ferruginous. Palpi and legs blackish with gray pubescence. 
Tarsi fuscous. 
In the Cabinets oj Mr. Stephens and the Author. 
