23. 

 SIAGONUM QUADRICORNE. 



Order Coleoptera. Fam. Staphylinidae Z/C/., Leach. 



Type of the Genus S. quadricoi ne K. 



SiAGONUM Kirbij Introduction to Entomology. 



Antenn(£ half the length of the insect, pubescent and hirsute, 

 straight, articulated; gradually increasing in size from the second 

 joint (which is smaller than the first) to the extremity 3 terminal 

 joint obovate. (f. 6.) 



Lahrum oxserted, transverse, bilobed, ciliated. (1.) 

 Mandibles of male much longer than the head, produced exter- 

 nally far beyond the apex, which has the appearance only of a 

 strong tooth, ciliated internally (2.) : of female, broad at their 

 base, hooked, very slightly produced externally. (2. a.) 

 MaxiUcE divided internally, ciliated ; terminal process dilated, 

 rounded, composed of parallel, transverse ribs, detached at the 

 apex : Palpi 4-jointcd, first joint small, last cylindric-ovate, ter- 

 minated by a globular gland. (3.) 



Mentum transverse, broadest at the base, lobed in the centre be- 

 hind, and obtusely pointed before : Palpi appearing 4-jointed, 

 all the joints corneous only at the base, last joint the longest. 

 Lip dilated anteriorly, bilobed, ciliated. (4.) 

 Head not broader than thorax, with a horn on each side before the eyes 

 in the males (vide the coloured figure) : females ivithout horns (fg.7.) . 

 Thorax narrowed behind. Elytra longer than broad. Abdomen li- 

 near, 6- and 7 -jointed. Legs very short and small. Tibiae ciliated in- 

 ternally, and serrated (except in the last pair) externally, spined. 

 Tarsi 5-jointed, last joint cqualin length to the other four (5. a fore- 

 leg). Wings long, broad, transparent, with only ^ short nerves at 

 the base. 



QuADRicoRNE PL \ . f. 3. Kirby and Spence's Int. to Ent. 



Depressed, shining, punctured ; antennae and abdomen pilose. 

 Head nearly black. Horns, mandibles, antennas and legs red- 

 dish brown. Thorax deep chesnut, quadrate, narrow behind ; 

 anterior margin rather convex in the centre, angles slightly pro- 

 duced, rounded, with a smooth line of colour down the centre. 

 Elytra chesnut 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 Cabinets of Mr. Kirby, Dr. Stephenson, atul the Author. 



A FIGURE of Siagonnm quadricornc was given in the 1st vol. 

 of the Introduction to Entojnology by Mr. Kirby, who took a 



