346 MANDIBULATA. COLEOPTER-A. 



pilose, terminal larger, ovate acuminate. Paljn nearly filiform, moderately 

 thickened, the terminal joint acute : /aZirwm entire : Aratf triangular, tumid 

 in front : ei/es large, globose : thorax short, obcordate or transverse, slightly 

 narrowed behind : bodij oblong, somewhat depressed : ahdunicn about twice 

 as long as the elytra, its apex distinctly mucronated : legs moderate ; tibia: 

 simple at the apex, their outer edge slightly setose : tarsi simple, pentame- 

 rous. 



Omalium in its restricted form, of which O. planum appears to be 

 the type, diifers by having the body oblong depressed, the thorax 

 short, transverse, slightly narrowed behind, the elytra scarcely half the 

 length of the abdomen, the tibiae simple; the antennae are short, 

 somewhat dissimilar to those of the other genera, as are also the 

 palpi, and general habit : — the species are mostly found in fungi, or 

 beneath the bark of trees, dung, &c.; and occasionally in flowers. 



A. With the thorax obcordate. 

 Sp. 1. planum. Nigrum, nitidum, subtilissime punctulatum, aniennis basi 

 elytris pedihusque testaceo-brunneis. (Long. corp. l^ lin.)' 



Sta. planus. Paykull.—Om. planum. Steph. Catal. 297. No. 3255. 



Depressed, black, shining : head Jinely and thickly punctured, with two minute 

 foveae between the eyes and two larger ones between the antenns : mouth 

 red; thorax with the posterior angles acute prominent, the disc finely, but 

 moderately, punctured, with an entire dorsal furrow, and an oblong fovea on 

 each side at the base : elytra twice as long as the thorax, irregularly, though 

 finely, punctured throughout, the punctures distinct, the disc testaceous- 

 hrown: abdomen rather smooth, with its apex rufescent : legs testaceous- 

 brown : antennce duskj-black, with the base testaceous. 



Found in Norfolk and Suffolk, and occasionally near Hertford and 

 in other parts of the metropolitan district ; also in Devonshire. 



Sp. 2. deplanatum. Rufo-tesiaceum, nitidum, subpubescens, creberrinie vag'e 

 punctatum, capite, thoracis disco, abdominisque 'dorso nigro-piceis. (Long. 

 Corp. If lin.) 



Om. deplanatum. Gravenhorst. — Steph. Catal. 297. No. 3256. 



Testaceous-red, shining, slightly pubescent, thickly and irregularly punctured : 

 head pitchy-hlack, flat, with a transverse elevated fold between the antennae, 

 and two small foveae behind it : eyes black : mouth testaceous : thorax 

 slightly convex, the hinder angles acute, not prominent, disc thickly punc- 

 tured, pitchy-hlack, but not foveated nor furrowed : elytra slightly depressed, 

 thickly and finely punctured, testaceous-red : abdomen jtitchj-black above, 

 with elevated margins, the terminal segments short, acuminate; beneath 



