175 



between bifid and appendiculate structure, the hinder of their 

 projections being a good deal smaller than the apical, though 

 too distinctly in the form of a triangular tooth to allow of 

 the claw being called appendiculate. Further differences are 

 to be noticed in the smaller size of this species, its prothorax 

 more transverse and less narrowed in front, and the very 

 notably finer puncturation of its elytra. Tl . ignobilis also 

 bears a general resemblance to H. Macleayi, Blackb., in 

 Group VIII., which, however, has hind claws simply appendi- 

 culate, pronotum less closely punctured, basal joint of hind 

 tarsi shorter, etc. In this species the trilobed outline of the 

 head scarcely differs from "that of H. sollicitus. 



North Queensland (Mr. Perkins). 

 H. infirmus, sp. nov. Sat elongato-ovalis ; sat nitidus ; 

 brunneo-testaceus ; supra pilis brevibus suberectis spar- 

 sius vestitus ; clypeo grosse rugulose punctulato, antice 

 late vix emarginato, oculos in exteriorem partem haud 

 superanti; labro clypei planum superanti; capite antice 

 (a tergo oblique viso) tripliciter convexo (parte mediana 

 quam laterales sublatiori) ; fronte sat crebre sat fortiter 

 nee rugulose punctulata ; hac clypeoque ut plana disparia 

 visis; antennis 9-articulatis ; prothorace quam longiori 

 plus quam duplo latiori, antice vix angustato, supra 

 subtilius sat crebre punctulato (puncturis circiter 20 in 

 segmenti longitudine) , lateribus (superne visis) modice 

 rotundatis, angulis anticis rotundatis parum productis 

 posticis (superne visis) rotundatis, basi haud sinuata, 

 margine basali sequali ; elytris nonnihil rugulosis, sub- 

 tilius minus crebre punctulatis (trans elytron puncturis 

 circiter 30) ; pygidio subtilius sat crebre punctulato ; 

 coxis posticis metasterno longitudine sat aequalibus, quam 

 segmentum ventrale 2 um multo longioribus ; tarsorum 

 posticorum articulo basali quam 2 US parum breviori quam 

 3 US paullo longiori; unguiculus bifidis. Long., 4 1. ; 

 lat., If 1. 



The general resemblance of this species and its immediate 

 allies is to subferrugineus, Burm., and its allies, and angustus, 

 Blackb., and its allies, from both which aggregates their con- 

 spicuously bifid claws separate them without difficulty. The 

 front tibiae of this insect bidentate externally (the 3rd — 

 uppermost — tooth being represented by a scarcely discernible 

 inequality of outline) is an unusual character. The trilobed 

 outline of the head is feebly developed and not at all divided, 

 the lobes overlapping strongly, the middle lobe (labrum) 

 unusually large, slightly wider than a lateral lobe. The 

 general appearance is frail and slender for a Heteronyx. 



Western Australia; Geraldton (Mr. Lea). 



