siibtilius minus sparsim punctulatis ; tibiis anticis extus 

 tridentatis ; tarsorum posticorum articulo basali quam 

 2 lis sat multo (quam 3^^^ vix) breviori ; unguiculis appen- 

 diculatis. Long., 3f 1. ; lat., If 1. 



The structure of the clypeus and labrum is as in //. in- 

 termedius, Blackb. From it however this species differs in 

 many characters. It is notably smaller, its prothorax is 

 quite fully twice as wide as long, with the front much less 

 narrowed, and the base all but non-sinuate, and the whole 

 dorsal surface is much less closely puxictulate. I believe the 

 two specimens before me to be males. 



New South Wales; exact locality not known. 

 H. additus, sp. nov. Minus elongatus, postice leviter dila- 

 tatus ; sat nitidus : ferrugineus ; supra pilis brevibus sub- 

 erectis sat crebre vestitus ; clypeo crebre ruguloso, antice 

 late leviter emarginato ; labro clypei planum vix attin- 

 genti, antice (capite a tergo oblique viso) truncato (vel 

 nonnihil concavo) ; fronte fortius sat crebre punctulata ; 

 clypeo fronteque ut plana sat disparia visis ; antennis 9- 

 articulatis, articulo 3° quam 2"s breviori; prothorace 

 quam longiori ut 7 ad 4 latiori ; antice vix angustato ; 

 supra fortius vix crebre punctulato (puncturis circiter 

 18 in segment! longitudine) , lateribus (superne visis) sat 

 arcuatis, angulis anticis sat acutis sat productis posticis 

 (superne visis) sat rectis, basi leviter bisinuata, margine 

 basali ad latera sat magis elevato ; elytris fortiter vix 

 crebre punctulatis (trans elytron puncturis circiter 22) ; 

 pygidio fortius sat crebre punctulato ; coxis posticis quam 

 metasternum sat brevioribus quam segmentum ventrale 

 2°'" sat longioribus ; femoribus posticis inter series sub- 

 tilius sparsissime punctulatis ; tibiis anticis extus tri- 

 dentatis ; tarsorum posticorum articulo basali quam 2^^ 

 multo (quam 3"^ nonnihil) breviori ; unguiculis appen- 

 diciilatis. Long., 4| 1.; lat., 2^ 1. 



The form of the labrum renders this species intermediate 

 between the two main divisions of Heteronyx. It cannot be 

 said that when the head is viewed obliquely from behind the 

 outline is not trilobed in a sense, but the middle division 

 {i.e., the outline of the labrum) appears as a straight line 

 or might almost be called faintly concave, and moreover the 

 labrum does not quite reach the level of the clypeus. A few 

 difficult species such as this is are, I fear, inevitable in the 

 grouping of any large number of allied species. The pro- 

 thorax almost as wide in front as at the base, and at its widest 

 in the middle distinguishes the present insect from most of 

 its congeners. The unique type is probably a male. 

 Western Australia; Swan River (Mr. Lea). 



