404 Rev. H. Clark on the Dytiscidae 



the margins being more or less broadly flavous : elytra broad, subglo- 

 bular ; the surface is finely pubescent, thickly and deeply punctate ; in 

 colour black or fuscous black ; at the shoulders transversely and also 

 along the line of margin are distributed several rufo-flavous markings 

 more or less broad and distinct in different examples ; at the shoidders 

 the marking is broad, does not reach the suture, and extends somewhat 

 beyond the hmneral angle for a short distance down the side ; along 

 the lateral margin are other markings, sometimes almost continuous, 

 sometimes consisting of two isolated spots (one medial and the other 

 near the apex) ; the apex itself is in all cases flavous : abdomen and 

 underside thickly punctate, rufo-testaceous, the apex of the abdomen 

 being fuscous : k(/s and antemtce rufo-testaceous. 



H. humeralis is abundantly distinct from all its congeners with 

 which I am acquainted : its large size separates it from other 

 Australian species ; from H. Senegalensis and Madagascar representa- 

 tives it may readily be distinguished. 



From the district of Victoria ; it has frequently been taken in the 

 neighbourhood of Melbourne, where it is evidently a common species. 

 In the cabinets of the British Museum, Mr. Bakewell, and the Ilev. 

 H. Clark. 



2. H. Blanchardn, n. sp. 



//. ovatus, brevis, supra convexus, pimctatus, rufo-ferrugineus, capite ad 

 basin fiisco ; thorace ad latera rotundato, antice constricto, ad basin late 

 fusco aut fusco bimaculato ; elytris obsolete imistriatis, sutura, maculis 

 duabus injequalibus tertiaque transversa juxta sutm-am nigris; pedibus 

 rufo-fuscis ; antennis pallide rufis. 



Long. Corp. 2^ lin., lat. 1^ lin. 



Broadly ovate, short, punctate throughout, rufo-ferruginous : head 

 large, finely and thickly pimctate, rufo-ferruginous, the base being 

 somewhat suftused with fuscovis : thorax transverse, the anterior 

 margin emarginate, the sides much constricted in front, and roimded 

 in form ; the surface is thickly punctate ; in colour rufo-ferruginous, the 

 base being broadly fuscous (occasionally the fuscous marking at the 

 base consists ovlj of two large suft'used fuscous spots, one on either side 

 of the middle) : elytra broad, thickly and coarsely punctate through- 

 out ; when viewed obliquely, an obsolete stria may be detected on either 

 side at some distance from the suture ; in colour rufo-ferruginous, with 

 the suture and also two medial longitudinal markings and a third near 

 the apex (irregidar and broad) being black ; these markings vary con- 

 siderably in size : the tinderside is thickly punctate and fuscous : abdo- 

 men rufo-fuscous : legs rufo-fuscous, the tarsi being frequently nigro- 

 fuscous : antenncs pale fuscous. 



The only species before me with which H. Blanchardn may be 

 confoimdcd arc H. C'aledonioi and H. australis : it is larger and rcla- 



