/- m* 
23 . 
SIAGONIUM QUADRICORNE. 
"7 
Order Coleoptera. Fam. Staphylinidae Lat, 
Type of the Genus , S. quadricorne Kirb. 
Siagonium Kirb., Curt. — Prognathus Lat. 
Antennas inserted in a cavity before the eyes, long, straight and hairy, 
11 -jointed, basal joint rather the longest, 2nd nearly as long as the 
3rd, both pear-shaped, the remainder ovate-truncate ; apical joint ra- 
ther longer than the 10th, the apex conical (6). 
Labrum exserted, transverse, deeply emarginate, bilobed, ciliated (1). 
Mandibles projecting beyond the head in the male, the apex forming 
a long curved claw, a short strong curved tooth on the inside at the 
centre, ciliated beneath (2) : elongate-trigonate in the female, the 
apex hooked, with a shoulder outside towards the apex, ciliated in- 
ternally (2 $ ) . 
Maxilla with a long ciliated internal lobe ; terminal one ovate, dilated, 
striated transversely, ciliated. Palpi longish, 4-jointed, basal joint 
small, 3rd short, 2nd and 4th the longest, the latter fusiform-trun- 
cate (3). 
Mentum transverse, lobed at the base, obtusely trigonate before. Lip 
broad, cordiform, ciliated. Palpi shortish, apparently 4-jointed, joints 
subquadrate, 4th longer ovate (4). 
Head as broad as the thorax, with a strong conical horn on each side in the 
males, before the eyes which are small and globose ; orbicular and unarmed 
in the female (7). Thorax depressed, semiorbicular , narrowed at the base : 
scutel triangular. Elytra oblong, longer than the thorax. Wings very 
ample. Abdomen long linear and marginate. Legs very short and small : 
thighs stoutish : tibiae spurred, 4 anterior , ciliated internally and serrated 
externally : tarsi longish, very slender and clavate, 5 -jointed, first 4 joints 
very short, 5th equal in length to the others united : claws long and slender 
(5, a fore leg.). 
Larva narrow, with distinct antennas, 6 pectoral feet and 2 anal appendages. 
Zool. Journ. v. 3. pi. 2. f. 1. 
Quadricorne Kirb. — Curt. Guide, Gen. 213. 1. — rufipennis Blond. Guer. 
Depressed, shining, punctured ; antennae and abdomen pilose : head 
nearly black : horns, mandibles, antennae and legs reddish-brown : 
thorax deep chestnut, with a smooth line of colour down the centre ; 
anterior margin rather convex in the centre, angles slightly produced 
and rounded. Elytra chestnut- colour, brightest towards the centre, 
with 2 branched and 2 simple -punctured striae on each : abdomen 
blackish, with, the edges of the segments reddish brown. 
In the Author's and other Cabinets. 
Fifteen years have elapsed since this genus first appeared in the pre- 
sent work, when accidentally the generic name was incorrectly spelt, 
117 
