and Gyrinidae of Australasia. 403 



Ovate, broad, covered throiio-liout with small closely arranged punc- 

 tures, much more minute than in the European species P. Hermanni, of 

 a flavous or rufo-flavous colour: headyerj finely pimctate, black: thorax 

 broadly transverse, larger than and not so constricted in front as P. 

 Hn-manni ; the surface is siibdepressed at the base : elytra broad, finely 

 punctate throughout ; luider a high power, traces may be seen of three 

 stria-like lines of paler flavous colour : abdome?i and underside black : 

 leys and antennce flavous. 



P. Australaske is somewhat larger than the common European 

 representative of this genus ; the thorax is broader, the punctures 

 more minute, and the colour uniformly and much paler : the species 

 apparently is not uncommon in the neighbourhood of Adelaide. In 

 the collections of the British Museum, of Mr. BakeweU, Mr. Water- 

 house, and the Rev. H. Clark. 



2. P. niger, n. sp. 



P. niger, statura minore, elytris confertim punctatis, antennis pedibusque 

 flavis. 



Long. Corp. 4 lin., lat. 2 lin. 



Oval, broad, considerably smaller than P. Australasice ; the sm-face 

 throughout is covered with thickly disposed pimctures, the colom* 

 black : head somewhat more sparingly punctate and glabrous : thorax 

 broadly transverse, the base being transversely subdepressed : ehjtra 

 broad, somewhat flattened in form ; the surface (as that of the thorax) 

 is thickly pmictate throughout, more closely and coarsely than in P. 

 Australasice : ahdotnen and underside black : leys and antennce rufo- 

 flavous. 



From the district of Moreton Bay. In the cabinet of Mr. BakeweU. 



Tribe III. Htdkopoeid^. 

 Genus 1. Hyphydetts, IU. 

 1. H. humeralis, n. sp. 

 H. ovatus, brevis, crassus, subpubescens, punctatus, niger ; capite flavo- 

 nifo, ad basin nigi'o maculato ; thorace nigro, ad latera flavo ; elytris 

 nigi'is, ad humeros usque ad sutm-am et ad latera plus minus flavis, 

 apice fusco ; pedibus antennisque rufo-testaceis. 

 Long. corp. 4 lin., lat. 1| lin. 



Broad, subglobular, somewhat depressed, subpubescent, pimctate, 

 black : head broad, with two obliquely transverse depressions, one on 

 either side ; at the inner margin of the eyes the surface is finely and 

 thickly punctate, more distinctly near the base ; in colour flavo-rufoua, 

 with two basal triangular fuscous markings : thorax broad, much con- 

 stricted towards the front, the anterior margin is slightly excavated, 

 the surface thickly and somewhat coarsely punctate ; in colour black, 



