372 On Aquatic Carnworous Coleoptera or Dytiscide. 
This species is very distinct by the prosternal process, and by the form of the 
thorax which is much narrower at the base than are the elytra. 
In the male the two basal joints of the front and middle tarsi are much dilated, 
the basal one being elongate as well as broad. 
Cape of Good Hope, (found by Drége). 168. 
I. 26.—Genus H YDROPEPLUS. 
Terminal joint of front tarsus quite twice as long as the third joint ; head rounded 
in front; elytra at the shoulder of the epipleura with a fossa limited behind by a 
distinct raised line. 
329. Hydroporus trimaculatus, Cast., M.C.—Ovatus, crassus, subdepressiusculus, 
dense subtilissime punctatus, opacus, sine pubescentia, supra fuscus, infra niger ; 
antennis pedibusque obscure testaceis; capite nigro in vertice macula minima 
ferruginea ; thorace ad latera paulo rotundato, marginibus late rufo-ferrugineis, 
macula oblonga ferruginea in medio postice notato ; abdomine rufo-nigro vel nigro. 
Long. 53, lat. 33 m.m. 
Mas, tarsis anterioribus et intermediis fortiter dilatatis, intermediorum articulo 
basali secundo evidenter latiore. 
Fem., tarsis anterioribus et intermediis sat dilatatis, intermediorum articulo 
basali secundo paulo latiore. 
Southern Africa, (Cape Town, Caffraria). 167. 
I. 27.—Genus PRIMOSPES. 
Terminal joint of front tarsus quite twice as long as the third joint; head 
subtruncate in front ; the depression at the base of the elytral epipleura not limited 
behind by a raised line. 
A single South African species is the only one known. 
330. Primospes suturalis, n. sp.—Ovalis, sub-opacus, subtilissime punctatus, sine 
pubescentia, niger, antennis pedibusque rufis, prothorace testaceo, medio maculis 
duabus fuscis, elytris fusco-testaceis, sutura margineque externo dilutioribus, lineis 
