On Aquatic Carnivorous Colcoptera or Dytiscida;. 379 



343. Hyphydrus signatus, n. sp. — Ovalis, convexus, nitidus, ferrugineus, prothorace 

 infuscato, lateribus dilutioribus, elytris nigro-signatis, stria discoidali distincta, sat 

 crebre valde insequaliter punctatis, punctis majoribus conspicuis, minoribus versus 

 basin subobsoletis. Long. 4, lat. 21 m.m. 



This closely resembles the female of Hyphydrus grossus, but is a little smaller, 

 and the punctuation of the upper surface is less marked. I have seen but two 

 individuals of the species, they, I believe, are both females. 



Africa, (Guinea). 452. 



344. Hyphydrus punoticollis, n. sp.— Ovalis, sat convexus, subtus piceus vel 

 testaceus, capite rufescente, prothorace nigro lateribus rufescentibus, elytris 

 testaceis, nigro-lineatis ; prothorace dense punctato ; elj'tris confertim, fortiter 

 inaequaliter punctatis, punctis majoribus conspicuis, stria discoidali ad basin distincta. 



Mas, nitidus, trochantcribus anterioribus incisura sat magna, tibiis anterioribus 

 vix dilatatis ; abdominis segment© apicali transversim impresso, apice medio elevato 

 et incrassato. Long. 4l lat. 3 m.m. 



Fern., (a.) nitidula ut in mare punctata. 

 {b.) opaca, obsoletius punctata. 



In this species the thorax is very densely punctured ; the elytra also are densely 

 punctured, and their large punctures are numerous and conspicuous. The species 

 is closely allied to Hyphydrus grossus, but the punctuation of the thorax is a good 

 deal denser, and the large punctures on the elytra are much less coarse and 

 conspicuous. 



Abyssinia. 36. 



345. Hyphydrus madagascariensis, Wehncke, Stet. Zeit. 1877, p. 150. — Ovalis, 

 sat convexus, minus latus, crebre sequaliter vix fortiter punctatus, ferrugineus, vertice 

 prothoraceque nigricantibus, hoc medio rufo, elytris nigro testaceoque variegatis, 

 stria discoidali obsoleta. Long. 5, lat. 31 m.m. 



Head with a deep impression on each side near the eye, reddish with the upper 

 portion blackish. Thorax red with the front and hind margins black, its hind 

 angles distinct, the sides not rounded. The elytra are rather finely but quite 

 distinctly punctured, without any larger scattered punctures, the discoidal stria 

 indistinct even at the base ; they are yellowish in colour, but largely covered with 

 confused and confluent black marks. 



I have seen only two individuals of this species ; their upper surface is shining. 

 The rather elongate form, the colour of the thorax, and the very evident impressions 

 on the head make this a species very easily distinguished. 



Madagascar. 155. 



TliAKS. KOY. DUB. SOC, N.S., TOL. II. 



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