and Gyrinidae of Australasia. 413 



Ovate, broad, of greatest breadth behind the middle, subattenuated 

 towards the apex ; very thickly punctate, of a reddish dull black colour, 

 with rufous maculations : head short, broad; near the inner margins of 

 the eyes are two shallow depressions : thorax broad, subparallel, the 

 anterior angles largely rounded ; the surface in front of the middle is 

 laterally subdepressed ; the sides are broadly marginate, the margin a- 

 tions being defined by a sharp deeply-cut fovea extending from the 

 front to the line of the base ; at the basal line are three suffused circular 

 markings of fusco-rufous, one on either side, and a third medial : elytra 

 broad, with four lateral subcircular fusco-rufous markings, three lateral 

 at the emargination, and a fourth opposite the one nearest the base : 

 hgs and antenna rufo-fuscous. 



Somewhat smaller than H. gravidus, and distinguishable also from 

 it by its colour, its maculations, and its thoracic margination. 



Two examples are in the collection of the British Museum, labelled 

 " New Holland." 



13. H. gravidus, n. sp. 



H. ovatus, latus, subdepressus, crebre punctatus, ater. 



Long. corp. 1$ lin., lat. £ lin. 



Broad, depressed, the surface is very thickly and coarsely punctured 

 throughout, in colour black : head broad, punctate ; the surface is un- 

 marked by any fovea or depression : thorax broad, the anterior angles 

 rounded, the sides broadly marginate ; in colour black, the marginations 

 being obscurely tinged with rufous, more distinctly near the basal 

 angles : elytra unmarked by any depression ; longitudinal line or stria 

 pitchy black ; near the apex and also medially (at the extreme edge of 

 the margination) is an obscure rufous marking : antenna fuscous, the 

 basal joints being rufo-fuscous : legs fuscous. 



This species is closely allied to H. undecim-maculatus ; but, after 

 careful comparison, I feel convinced that it is distinct. It is a trifle 

 larger in size ; the colour is pitchy black, not rufo- pitchy black ; the 

 head has no foveae, there are no traces of any maculations, except such 

 as have no affinity with this latter species ; and, especially, the hollow - 

 ing-out of the thoracic margination (when seen obliquely from in front) 

 is bevelled off as a shallow depression — not sharply cut, so as to form 

 a deep angular fovea. 



I received some years ago a single example of this species from 

 Mr. Stevens, from Port Essington. 



14. H. Bahewellii, n. sp. 

 H. ovatus, latus, depressus, crebre punctatus, flavus ; elytris flavis, nigro 



notatis. 

 Long. corp. If lin., lat. f- 1 lin. 



2h2 



