NO. 5 CURTIS' BRITISH ENTOMOLOGY — BLACKWELDER 



23. 

 SIAGONIUM QUADRICORNE. 



Order Coleoptera. Fam. Staphyliniclae Lat. 



Type of the Genus, S. quadricorne Kirb. 



SiAGONiuM Kirb., Curt. — Prognathus Lat. 



AntenncE 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). 

 Lahrum 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 

 7)iales, be/ore 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, afore leg.). 

 Larva narrow, with distinct antenna, 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 



Fig. 2. — Facsimile of page from second edition. 



