BY THE REV. T. BLACKBURN. 285 



lobed, the front angles almost right angles and scarcely at all 

 produced, the hind angles rounded off, the sides strongly rounded. 

 The lower two external teeth of the front tibiae are very strong 

 and sharp, the uppermost is very minute. The apical piece of the 

 hind claws is a little longer than the produced apex of the basal 

 piece, which is truncate at the apex. 



In my tabulation of the group of Reteronyjc (Section iii., Group 

 VI., P.L.S.N.S.W. 1889, p. 426-8) in which this species finds a 

 place it falls on p. 427, BB. (line 7) beside hidentatus, from which 

 its totally different puncturation and the strongly developed 

 trilobed outline of its clypeus will at once distinguish it. 



W. Australia ; sent to me by C. French, Esq. 



Heteronyx marcidus, sp.nov. 



Sat elongatus ; postice leviter dilatatus; minus nitidus; piceus, 



pedibus obscure rufescentibus, palpis antennisque pallidiori- 



bus ; subtiliter sat sparsim pubescens ; capite confertim 



rugulose nee crasse, prothorace subtiliter sat confertim, elytris 



subtiliter confertim subsquamose, pygidio sparsim subfortiter, 



punctulatis ; labro clypeum vix superanti ; antennis 8-articu- 



latis ; unguiculis appendiculatis ; coxis posticis quam metas- 



ternum sat brevioribus quam segmentum ventrale secundum 



sat longioribus. [Long. 5, lat. 2| lines. 



This species is exceptional in its group through the very slight 



prominence of the labrura, owing to which the trilobed appearance 



of the outline of the head is very feeble, the even curve of the 



outline (from the most favourable point of view) being disturbed 



only to the extent of appearing to bulge forward into manifestly 



greater convexity in the middle. The fi'ont tibiae are strongly but 



not sharply tridentate externally. The prothorax is much wider 



than long (as 12 to 7), the base (which is bisinuate but scarcely 



lobed) much wider than the front (as 11 to 7), the sides gently 



arched, the front angles sharp but little prominent, the hind 



angles roundly obtuse (but, viewed from above, appearing right 



angles). The elytra bear scarcely a trace of striation. The apical 



piece of the hind claws is about equal in length to the basal piece. 



