408 Mr. T. V. Wollaston on the Coleoptera of St. Helena. 



been compiled, and wliich was taken in St. Helena by Mr. 

 Melliss, has such a curious outline, as compared with the 

 other members of the genus hitherto known, that, before exa- 

 mination, I thought it just possible that it would prove to be 

 but an ill-developed individual of one of the cognate brassy 

 forms ; but a more accurate inspection convinces me that it is 

 thoroughly distinct and well-defined. Its comparatively nar- 

 row outline, indeed, when contrasted with the remainder of 

 the seneous species, and greatly attenuated anterior portion of 

 its elytra (causing the latter to be almost equally narrowed 

 before and behind), added to its ovate prothorax, give it an 

 appearance unlike that of any of its allies : and, amongst less 

 conspicuous features, the minute asperities or points which 

 stud the extreme base of its elytra (particularly towards the 

 shoulders) should be likewise noticed. Its punctation is more 

 distinct than in the M. ohliteratus, and its elytral stria3 are 

 placed closer together, leaving the interstices narrower, and 

 branded apparently with only a single row down each of large 

 rounded punctures : its limbs, also, are a trifle slenderer and 

 darker, with the antennee (the first joint of the funiculus of 

 which is, if anything, perhaps somewhat sJiorter than the 

 second) appreciably less elongate. 



§ II. Femora postica spina magna acutissima subhasali supra 

 armata. (Microxylobii aherrantes. Subg. Thaumasto- 

 MEEUS, Woll.) 



A. Funiculi art^ 1'""* secundo vix latior ; 2*** tertio midto longior. 



42. Microxylobius Chevrolatii. 



M. elongatus, oblongo-fusiformis, aeneus sed interdum etiam sub- 

 nigrescens, nitidus, calvus ; capite rostroque sat confertim et 

 argute punctulatis, hoc longiiisculo, subtereti, apice obsolete de- 

 press© ; prothorace subovato, basi truncate, ad latera rotundato, 

 confertim sed minute ac levissime punctulato ; elytris oblongis, 

 leviter et late striato-punctatis ; interstitiis latis et leviter punc- 

 tatis (punctis quasi in serie triphci obsoletissime dispositis) ; an- 

 tennis riifo-piceis, longiusculis, funiculi art" 2^^° primo sublon- 

 giore ; pedibus elongatis, nigro-piceis, tarsis rufo-piceis. 



Long. Corp. lin. 2|-vix 3. 



Microxtjlohius Chevrolatii, Woll., Trans. Ent, Soc. Lend. v. 383, pi. 18. 

 f. 8 (186 L). 



This is the largest of the Microxylohii hitherto detected, 

 and it may be known (amongst the other brassy forms) by its 

 elongate, somewhat oblong outline, and very finely and lightly 

 punctulated prothorax. Its legs, feet, and the second joint of 

 its funiculus are a good deal lengthened ; and, as in the two 



