66 



longiori vix tertia parte latiori, quam caput vix latiori, 



canaliculato, obscure traiisversim rugato, lateribus minus 



late reflexis ante medium subangulatis ante angulos posticos 



sinuatis, his obtusis sat distinctis ; elytris striatis, interstitiis 



sat planis (nihilominus 3° 5° 7° que apicem versus carinatis, 



3° mox ante apicem externe abrupte angulatim dilatato), 3° 



punctis 2 vel 3 instructo. 



Maris segmentis ventralibus 3-5 in medio sat crasse trans- 



versim rugatis vel squamoso-punctulatis et setis pallidis 



obsitis. Long., 7 1. ; 1 at., 3 1. 



The sides of the prothorax very distinctly sinuate behind (and 



angular before) the middle, together with the peculiar sculpture 



of the elytral interstices posteriorly, render this a very distinct 



species. The prothorax is scarcely more than half as wide as the 



elytra. The peculiar external angulation of the hind part of the 



third elytra] interstice is best observed by looking along the 



elytra with the head of the insect directed towards the observer 



when it is very conspicuous. Compared with D. Goryi, Boisd. 



(apart from colour and the very different shape and proportions 



of the prothorax), this species has the prothorax obscurely 



roughened with line puncturation (where in Goryi it is strongly 



rugulose), much less Avidely margined, kc. ; the elytral interstices 



much less convex and very differently formed at the apex ; also 



the ventral segments of the male much less nitid and having all 



the middle part sculptured and setiferous (in Goryi there is an 



irregular line of setiferous rugulosities on either side of the 



middle line). Of other previously described species gigas, Cast., 



puQictipennis, Cast., and quadricolUs, Cast., are inter alia much 



larger, jjunctato-striata, Cast., has elytral striie strongly punctured, 



montana, Cast., has the prothorax " short and transverse," 



tainnta^ Cast., is much smaller than the present species, and 



brevicoUAs, Chaud., has the prothorax even more transverse than 



D. Goryi. 



S.A. ; near Port Lincoln. 



HYDROPHILID.i:. 



PARACYMUS. 



P. nigerrimus, sp. nov. Breviter ovalis ; convexus ; nitidus ; 



niger, nullo modo metallescens ; antennis (clava excepta) 



prothoracis lateribus pedibus elytrorumque apice rufescenti- 



bus ; corpore supra subla?vi-elytris sub lente forti vix per- 



spicue punctulatis. Long., 1} h ; lat., ^ 1. 



The complete absence of sculpture — except the sutural stria of 



the elytra which is obsolete in front — will distinguish this species 



from all its known allies. Unfortunately, I have not been able 



