57 



A species of neat, sharply-punctured general appearance 

 with a somewhat unusually narrow and elongate head. It is 

 closely allied with //. vintor, Blackb., Virfori-^, Blackb., and 

 sorius, Blackb., differing, infer alia, from viator by its head 

 distinctly longer and narrower and by its prothorax consid- 

 erably more narrowed in front and having better-defined hind 

 angles; from Virforis by its broader form, its much more 

 transverse prothorax, and the puncturation of its elytra 

 coarser and more sparse : and from socii/s by its evidently 

 more transverse prothorax and the distinctly sparser punc- 

 turation of its elytra. The unique type is, I think, certainly 

 a female. It should be noted that in this species and the 

 other three just mentioned the hind coxae, though much 

 shorter than the metasternum and not very much longer than 

 the 2nd ventral segment, yet cover the 1st ventral segment. 



Western Australia. 

 H . socius, sp. nov. Sat elongatus, postice leviter dilatatus ; 

 sat nitidus : obscure brunneus, antennis palpis pedi- 

 busque dilutioribus : supra pilis brevibus suberectis sub- 

 crebre vestitus : clypeo confertim rugviloso antioe rotun- 

 dato : labro summo clypei planum baud attingenti ; 

 fronte fortiter crebre rugulose punctulata ; clypeo fron- 

 tecpie ut plana sat disparia visis ; antennis 9-articulatis, 

 articulo 3" quam 2"^ sat breviori : prothorace quani long- 

 iori ut 15 ad 9-?, latiori, antice sat fortiter angustato, 

 supra fortius subcrebre punctulato (puncturis circiter 18 

 in segmenti longitudine), lateribus pone medium sat 

 dilatato-rotundatis, angiilis anticis minus acutis minus 

 productis posticis (superne visis) obtusis, basi leviter bi- 

 sinuata, margine basali sat sequali ; elytris sat fortiter 

 sat crebre punctulatis (trans elytron puncturis circiter 

 25): pygidio granulis setiferis instructor coxis posticis 

 quam metasternum multo bi'evioribus , quam segmentum 

 ventrale 2"'" paullo longioribus ; tibiis anticis extus tri- 

 dentatis ; tarsorum posticorum articulo basali quam 2"* 

 \ix (quam 3"^ sat) longiori : unguiculis appendiculatis. 

 Long., 4:1-4:2 1.: lat., 2-21 i. 



As noted above (under fJ . rriundus), this species is closely 

 allied with three others. Its nearest ally is H. Vicforis, 

 Blackb., from which it differs (disregarding colour: the dor- 

 sal surface of the unique type of 77. Vicfori.<< is nearly black), 

 i?7fci' alia, by its prothorax notably more transverse and less 

 narrowed in front, with sides considerably rotundate-dilatate 

 behind the middle. The prothorax of H . Victoris is among 

 the least transverse and most strongly narrowed forward of 

 any in the genus. //. xnriirs is difficult to place in my tabu- 

 lation of this subgroup, because the puncturation of its pro- 



