COLEOPTERA 615 



I. Eyes always of enormous size at least in the <?, the width of one of these never less than the space, 

 where least, between them, and often very much wider than this space. 



(a) Species chiefly testaceous or ferruginous in colour M. oculatiis, kstaceus, pundatissimiis, 



excelsior, pyrophilus, basalts. 



(/') Species black, dark brown, or piceous M. sordidus, hawaiieiisis, /rigldits, epielirvsiis, duplex 



( $ with small eyes), laiiaieiisis. 



II. Eyes rarely so large that the width of one in the $ is subequal to the space, where least, between 

 them, usually widely separated and often of comparatively small or moderate size {Af. muticus $ , discolor $ 

 and a few others approach M. lanaiertsis in the size of the eyes, so that there is no abrupt division between 

 these sections and M. nigrocastaneus should perhaps be placed in the first, though I have included it in 

 Div. II.). 



(i) Elytra above (i.e. not considering the deflexed lateral parts) always with an extremely sparsely punc- 

 tured, glabrous, or almost bare area on the more basal part at least, sometimes with the whole or 

 almost the whole surface glabrous or nearly and extremely few punctures, or in a condition inter- 

 mediate between these extremes ; surface of the glabrous or subglabrous part usually polished, rarely 

 dull and with fine rugulosity, the very remote punctures of the glabrous portion often of rather large 

 size (compared with parts densely punctured) and feebly impressed. 



(a) Elytra either with no dense puncturation or only so punctured more or less narrowly along the 

 suture or on the basal margin or on both basal and sutural margins. 



{ci) Basal joint of the antennal club, at least in the $ , of unusual form, elongate and very 

 narrow AJ. kai/aieiisis, mulokaie/isis. and ignofus. 



(/'') Insects brightly marked black and yellow M. xanthostictus and hicolor. 



((■') Species not as in {a') and (/'') M. affinis, inoiita/iits, riigipeniiis, simplex, denudatus, 



laiifrons, irregularis, inaurus, laevis, fractus, pannilus, eutheorus, nigrocastaneus, angulatus, 

 pallidicornis, glabripennis, peles. 



(/') Elytra with an extremely dense puncturation on the apical portion, extending far outwards from 

 the suture, sometimes to the lateral margins. 



(a) Elytra with excessively minute whitish tomentum on the apical portion, in front of this 



with a patch or band of coarser yellow or golden pubescence M. blackburni, black- 



burnioides. 



(/'') Elytra not so clothed M. sculptus, varicolor, liigubris, pusillus, parcus, subj>arcus, 



amaius, cognatus, ko?ianus, hypocoelus. 



(2) Elytra above without a glabrous and extremely sparsely punctured area near the base, sometimes 

 densely punctured all over, or all but a space along the lateral margins, and often nearly evenly 

 pubescent all over. In some species the punctures are noticeably less dense on the part between 

 the densely punctured apical part and the extreme base, but the punctures are never extremely 

 sparse and remote. Sometimes the puncturation, though sufficiently dense, is shallow and 

 indefinite. 



(a) Antennal club large in the $ or with the first or first and second joints in some aspects sub- 

 quadrangular M. eximius, solitarius, punctafusQ), amau?-odes, elongatulus, discolor, muticus, 



carinatus, acutusQ), liigubris var., plebeius, dubiosus, tetragonus, rufescens, marginatus. 



(b) Antennal club moderate or small, or with the basal joint unusually elongate for its width 



M. tristis, vestitus, varius, debilis, hirsutulus, stenarthrus, dimidiatus, obscurus, solidus. 



79—2 



