400 Rev. H. Clark on (he Dytiscidse 



unci, especially, Mr. Bakewell. The following pages Avill include, pro- 

 bably, nearly every species that has as yet been brought in collections 

 to this country. It will be seen that nearly all that we know as yet 

 of the fauna of that vast continent is furnished by the neighbour- 

 hood of Melbourne, which has been so carefully examined by Dr. 

 Howitt and Mr. Bakcwell. 



Family Dytiscidae. 

 Tribe I. Haliplid-i:. 

 Genus Halipltjs, Latr. 



1. H. testudo, n. sp. 



11. ovatus, subelongatus, pallide ferrugineia ; thorace antice constricto, nd 

 basin et antice fortiter nigro punctato ; elytris nigro striatis ; antennis 

 pedibusque pallide furrugineis. 



Long. corp. 2 lin., lat. 1 lin. 



Ovate, somewhat elongate, convex, of a pale-ferruginous colour: 

 head narrow, subelongate, impunctate ; eyes large : thorax transverse, 

 at the base nearly twice the breadth of the medial length, the sides are 

 very slightly rounded, and very much constricted towards the front ; 

 the surface at the base is medially somewhat depressed, and impressed 

 with two or three irregular rows of coarse black punctures ; the an- 

 terior margin is also medially more or less distinctly punctured : 

 elytra ovate, the outline being broadly dilated near to the thoracic 

 angle (the greatest breadth being in front of the middle of the insect) ; 

 the surface is marked by ten deeply punctured stria?, of which eight 

 are perceptibly marked by dark lines from the apex to the base (the 

 two lateral stria? being uncoloured) : leys and antennce pale ferru- 

 ginous. 



H. testudo may be separated from H. austndis by the manifest 

 coloration of the thoracic punctures and also of the stria? of the 

 elytra ; in H, testudo the interstices between the stria? are lawigate, 

 and not sparingly punctate as in H. austrcdis. 



This species does not appear to be abundant. The four examples 

 before me (all fairly uniform in colour and striation) are from the 

 neighbourhood of Moreton Bay. 



In the collections of the British Museum, Mr. Bakewell, Mr. 

 Waterhouse, and the Rev. Hamlet Clark. 



2. H. avstralis, n. sp. 



H. ovatus, convexus, subelongatus, pallide flavus ; thorace antice con- 

 st ricto, ad basin et antice punctato ; elytris piuictato-striatis et inter 

 Btriaa punctatis; antennis pedibusque ilavis. 



Long. corp. 1 ! 2 lin.. lat. 1 lin. 



