414 Rev. H. Clark 071 the Dytiscidse 



Ovate, broad, somewhat depressed, attenuated towards the apex, 

 flavous : head short, broad ; on either side within the margins of the 

 eyes is a narrow depression ; the surface is finely punctate : thorax 

 broad, rounded in front, the sides marginate, in front and near the base 

 transversely subdepressed ; the surface is finely punctate, flavous, the 

 anterior and posterior margins being narrowly and evenly fuscous 

 black : eli/tra thickly and finely punctate, flavous, with two, three, or 

 four longitudinal markings of fuscous black; in one of the two ex- 

 amples before me the colour is rather fuscous black, with two inter- 

 rupted and irregular medial bands of flavous. The great dissimilarity of 

 pattern between these two examples plainly shows that the species is 

 subject to much variety ; it may readily be distinguished from all others 

 by its sectional characters, the absence of any thoracic fovea, the angle 

 formed by the sides of the elytra and the thorax, and by its smaller 

 size. 



I know of but two examples of this pretty and very distinct little 

 species, which I have pleasure in dedicating to R. Bakewell, Esq., 

 whose fine collection has formed the basis of my catalogue of the 

 species of these genera. 



Moreton Bay. In the cabinets of R. Bakewell, Esq., and the Rev. 

 Hamlet Clark. 



B. Thorax striola utrinque basali. 



1. Striola in elytbis haud coNxiNrATA. 

 In this section, the first four species, H. Gfilbertii, H. penicillatus, H. 

 Wollastonii, and IT. dispar, have the thoracic fovea not so sharply 

 defined ; it is rather one of a small basal group of two, three, or more 

 longitudinal striae. 



15. H. Oilbertii, n. sp. 



H. oblongo-ovalis, subtiliter punctatus, flavus, nigro lineatus. 



Long. corp. 2;^-2| lin., lat. 1-lj lin. 



Ovate, broad, depressed, thickly pimctate, subpubescent, flavo- or 

 rufo-ferruginous : head finely and thickly punctate, in colour flavo- 

 testaceous : thorax broad, in front distinctly excavated, the sides some- 

 what rounded and constricted towards the front ; at the base are two 

 short well-defined longitudinal fovese, which extend parallel to and at 

 a slight distance from the lateral margins ; the surface is thickly punc- 

 tate, in colour rufo-flavous or testaceous ; in the darker examples the 

 anterior and posterior margins are suffused with fuscous : eli/t7-a broad 

 and somewhat rounded at the sides, depressed ; the surface is thickly 

 and finely punctate, the punctures being to some extent in many ex- 

 amples concealed by very fine pubescence ; obsoletely pimctate striae are 

 to be discerned, one closely adjoining another at some distance from the 

 suture ; in colour varying from rufous to fusco-flavous, with longitudinal 



