On Aquatic Carnivorous Coleoptera or Dytiscida. 391 
371. Hydroporus solieri, Aubé, M.C.—Ovalis, sat brevis, convexus, sine pubes- 
centia, testaceus; elytris lineis quatuor pluries valde interruptis nigris, dense 
punctatis ; corpore subtus fortiter punctato. Long. 5, lat. 3 m.m. 
Mas, supra fortiter punctatus sat nitidus, tarsis anterioribus et intermediis fortiter 
dilatatis, tibiis intermediis ad basin angustis, dimidio inferiore lato intus sub- 
angulatim dilatato. 
Fem., subtiliter punctata opaca, pedibus simplicibus. 
This species varies greatly as to the black markings, which are sometimes nearly 
entirely absent. 
Egypt, Persia, Arabia, Northern India. 174. 
I. 38.—Genus PAROSTER. 
The longitudinal ridge on inner face of wing-case very little developed ; posterior 
coxal cavities much exposed and a good deal separated; posterior portion of 
epipleura very narrow; hind tibia with only the serial punctures on the infero- 
external face. Mesosternal fork not connected with the inter-coxal process of 
metasternum. 
The three species have the hind coxal cavities more exposed and separated than 
any other Hydroporini, and in this respect approach Bidessus of the Bidessini. 
They are found in Australia. 
372. Hydroporus nigro-adumbratus, Clk., M.C.—Ovalis, convexus, sine pubescentia, 
nitidus, fuscus, antennis, pedibus, thorace in medio et ad latera elytrisque testaceis ; 
prothorace anterius et posterius subtiliter punctato, medio impunctato ; elytris 
parce, subtiliter sed evidenter punctatis ; corpore subtus fere impunctato ; tibiis 
anterioribus apicem versus latis. Long. 33, lat. 2 m.m. 
Mas, tarsis anterioribus dilatatis, unguiculis valde elongatis. 
I have seen but a single individual of the species. 
Australia, (Adelaide). 419. 
373. Paroster pallescens, n. sp.—Ovalis, convexus, sine pubescentia, vix nitidus, 
fuscus, supra cum antennis pedibusque testaceus, capite magis obscuro ; thorace 
elytrisque sparsim subtilius punctatis; corpore subtus fere impunctato ; tibiis 
anterioribus versus apicem latis. Long. 33, lat. vix 2 m.m. 
