402 Mr. T. V. Wollaston on the CoUoptera of St. Helena. 



limbs, as still to justify my original conclusion tliat many 

 species even yet remain to be detected. 



I may here add tliat the members of the second of the two 

 sections under which I distriljuted the Microxylohii have an 

 acute, more or less conspicuous spine towards the base of the 

 upper edge of their femora ; and for this, lest hereafter it 

 should pcrcliance be found desirable to separate it as a distinct 

 group, I pro])Osed the subgeneric name of Thaumastomeriui. 

 It would appear, however, that in 1858 Boheman (Res. Eugen. 

 141, tab. ii. f. 7) published one of the exponents of that parti- 

 cular section (according to Lacordaire, Gen. vii. 327, note 2, 

 my M. Chevrolatii) under the name of '^ Acanfltomenis ar- 

 mains •^'''' so that if ever the two divisions should be treated as 

 distinct genera, the title of the one with armed thighs will 

 have to be Acanthomerus^ and not Thaiimastomern^. My own 

 belief, however, is, that the Avhole of the species which com- 

 pose the two sections are so intimately connected that it would 

 be exceedingly unwise, on account of the spinose femora of 

 some of them, to attempt to draw a line of generic demarca- 

 tion between them. But, be this as it may, the specijic title, 

 at any rate, of my 21. Chevrolatii will (assuming Lacordaire's 

 identification as correct) be compelled to yield to that of ar- 

 matus, under which it was previously published by Boheman. 



The three species above alluded to, Avhich have to be added 

 to the St. -Helena list, may be enunciated as follows : — 



Micro xylohius dimidiatus, n. sp. 



M. ovato-fusiformis, niger, nitidulus ; capite rostroque parce et le- 

 viter piinctatis ; prothorace magno, convexo, subquadrato-ovaU, 

 in medio rotundate latiusculo, profunde sed vix confertim puiic- 

 tato ; clytris breviusculis, rugidosis, punctato-striatis. interstitiis 

 uniseriatim punctatis, intordum (saltern postioe) sotulis miiuitis 

 cinereis (vix obscrvandis) parce obsitis ; autennis rufo-piceis ; 

 pedibus breviusculis, piceis. 



Long. Corp. Hn. l^-lg- 



Two examples of this little Microxylohius were amongst a 

 former small collection (transmitted to me more than a year 

 ago by ]\[r. Melliss) from St. Helena. Although with abun- 

 dant distinctive features of its own, in certain respects it is 

 sliglitly intermediate between the laccrtosus and bicifinjus^ 

 combining somewliat the size and outline of the former with 

 the less opaque and more punctured surface of the latter : yet 

 neither in outline nor in sculpture is it in any wise identical 

 with either of them. It is a small species (apparently not 

 much, if at all, larger than the lacertosuft), and has a faint 

 tendency, under a liiuli microscopic p(nver, to be stuildod pos- 



