Descriptive List of the Species of Rhysodes. 663 



Art. IV. — A Descriptive List of the Species of Rhysodes. By 

 Edward Newman, Esq., F.L.S. 



COLEOPTERA, PEJYTAMERA. 



Genus Rhysodes, Dalman, Latreille in litt. 



Clinidivm, Kirby. 



Head porrected, slightly narrower than the prothorax. Antennce monili- 

 form, placed near the mouth, 11 -jointed, scarcely as long as the prothorax. 

 Labrum semicircular, with the front slightly produced hetween two bristles. 

 Mandibles longer than broad, tridentate at the tip. Maxillce broad at the 

 base, lacinia elongate, narrow and acute at the tip.* Maxipalpi 4-jointed; 

 the first and third joints short, the second about twice as long as the first, 

 and rather incrassated in the middle; the fourth twice as long as the second, 

 gradually diminishing to the tip, which is very acute, and projects beyond 

 the mouth. Labium small, triangular, and hidden by the large mentum. 

 Labipalpi 3-jointed, the joints of nearly equal length; the first is slender, 

 the second slender at the base but incrassated exteriorly, the third slender 

 at the base, incrassated in the middle, and acute at the tip. Tarsi 5-joint- 

 ed, claws simple. 



The species of this genus inhabit the decayed wood and 

 bark of trees. 



Geographical distribution. — Europe, Africa, Island of Java, 

 North and South America. 

 Authorities. — 



Dalman : 'Analecta Entomological p. 93. 

 Gyllenhall : ' Insecta Suecica,' torn. i. pt. iv. p. 332. 

 Kirby : ' Zoological Journal,' vol. v. p. 6., under the name 

 Clinidium ; (by a reference to which paper the reader 

 will find that Mr. Kirby has described the genus as 

 new, from not being aware of M. Latreille's genus Rhy- 

 sodes, and not from any wish to separate his species 

 from that genus). 

 Westwood : ' Zoological Journal,' vol. v. p. 213 ; supple- 

 mentary plate xlvi. fig. 1. (This author's descriptions 

 of the mouth are quoted above nearly verbatim ; his 

 dissections also have been kindly placed in my hands). 



Sp. I. Rhys, strabus. Niger, nitidus; caput subtrigonum, angulis 

 posticis quadratum, vertice profunde excavatum ; oculi distincti, late- 

 rales, subtrigoni, verticem versus subacuti ; prothorax profunde tri- 

 sulcatus ; elytra septem-striata, striis regulariter punctatis. (Corp; 

 long. .325 unc. lat. .085 unc.) 

 Colour shining black ; the head is nearly triangular, the posterior angles 

 being rather produced and clearly defined ; on the crown is a very deep fo- 

 vea, from which a deep furrow issues anteriorly, and, dividing to inclose a 

 raised glabrous space between the antennce, it again unites in a depressed 

 space adjoining the clypeus ; posteriorly a narrow furrow issues from the cen- 



* I am uncertain whether the part here described is the galea or lacinia; 

 one or other of these parts appears to be obsolete. 



