16 Rey. H. Clark on the Dytiscidee 
with very minute punctures. In the elytra the longitudinal flavous 
marking extends from the base to a little beyond the middle; it is 
almost medial, being rather nearer the margin than the suture; at 
the apex is a second separate and similar marking, extending ob- 
liquely from the margin to the apex ; on the surfice of either mark- 
ing may be discerned small circular rufo-fuscous macule. 
The only example that is known of this genus is in the collection 
of the British Museum ; it was received many years ago from the 
north-east coast of Australia. 
Genus 2. Cotymperss, Clairv. (Ent. Helv. 1. p. 188). 
1. C. lanceolatus, n. sp. 
C. oblongo-ovalis, ad apicem subattenuatus, rufo-ferrugineus, nitidus ; 
capite rufo, ad basin et inter oculos late nigro; thorace leviter et dense 
punctato, preesertim ad basin, antice fovea transversa fortiter punctata, 
rufo-ferrugineo vel rufo-flavo, ad basin et antice anguste nigro mar- 
ginato, ad basin plerumque maculis nigris, ad medium duabus; scutello 
nigro; elytris tribus punctorum seriebus, subtilissime reticulatis, sutura 
et sex lineis eequalibus parallelis nigris; pedibus rufis; antennis rufo- 
flavis, corpore infra rufo, abdominis segmentis nigro marginatis. 
Long. corp. 53 lin., lat. 2} lin. 
Of the thirteen examples before me of this species, there is not 
one which presents any variety either in shape or pattern: its 
narrow elongated form, acuminated towards the apex, and its evenly 
disposed markings on the elytra abundantly separate it from all 
other species known to me, either in Australia or elsewhere. 
C. lanceolatus is found in New Zealand, Van Diemen’s Land, at 
Melbourne, and Adelaide. 
In the collections of the British Museum, Mr. Bakewell, Mr. 
Bowring, Mr. Waterhouse, and the Rey. Hamlet Clark. 
2. C. pulcher, n. sp. 
C. ovalis, sat brevis, rufo-fuscus ; capite ad apicem infra oculos bifoveo- 
lato, rufo, ad basin et transverse inter oculos nigro; thorace ad latera 
subrotundato, immarginato, impunctato, levi, ad basin et antice trans- 
verse subdepresso et sparsim rufo punctulato, tenuiter nigro; scutello 
nigro ; elytris fusco-nigris, ad latera et apicem rufo irroratis, punctorum 
seriebus duabus (veluti striis) minutis sparsis; antennis pedibusque 
rufis; corpore subtus rufo-fusco, 
Long. corp. 53 lin., lat. 23 lin. 
A distinct and handsome species, to be recognized from others of 
the group by its rufous thorax, margined in front and at the base by 
a narrow, even line of black. 
