On Aquatic Carnworous Coleoptera or Dytiscide. 379 
343. Hyphydrus signatus, n. sp.—Ovalis, convexus, nitidus, ferrugineus, prothorace 
infuscato, lateribus dilutioribus, elytris nigro-signatis, stria discoidali distincta, sat 
erebre valde inzqualiter punctatis, punctis majoribus conspicuis, minoribus versus 
basin subobsoletis. Long. 4, lat. 2¢ 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 puncticollis, n. sp.—Ovalis, sat convexus, subtus piceus vel 
testaceus, capite rufescente, prothorace nigro lateribus rufescentibus, elytris 
testaceis, nigro-lineatis ; prothorace dense punctato; elytris confertim, fortiter 
inzequaliter punctatis, punctis majoribus conspicuis, stria discoidali ad basin distincta. 
Mas, nitidus, trochanteribus anterioribus incisura sat magna, tibiis anterioribus 
vix dilatatis ; abdominis segmento apicali transversim impresso, apice medio elevato 
et incrassato. Long. 43 lat. 3 m.m. 
Fem., (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 equaliter vix fortiter punctatus, ferrugineus, vertice 
prothoraceque nigricantibus, hoc medio rufo, elytris nigro testaceoque variegatis, 
stria discoidali obsoleta. Long. 5, lat. 3; 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, 1955. 
TRANS. ROY, DUB. SOC., N.S., VOL. IL 
3D 
