370 On Aquatic Carnivorous Cokoptera or Dytiscidce. 



a very old individual was contained in Chevrolat's collection, with the label " Hydro- 

 porus apicalis, Chev. Australia, bor." ; the other two were in Andrew Murray's New 

 Zealand collection, labelled " nov. spec. New Zealand." The true habitat is there- 

 fore still to be ascertained. 



Northern Australia ; (Mus. Chevrolat). New Zealand, (Mus. Murray). 100. 



I. 24.— Genus TYNDALLHYDRUS. 



Prothorax narrowed behind, prosternal process prevented by the contiguous and 

 intervening middle coxse from attaining the metasternum. 



This is an autogenus of which only an unique individual is known. 



327. Tyndallhydrus caraboides, n. sp. — Oblongo-ovalis, breviusculus, sine pubes- 

 centia; dense punctatus, opacus, testaceus, elytris signaturis interruptis nigris ; 

 prothorace valde transverso, elytris angustiore, posterius angustato, utrinque striga 

 obliqua profunde impressa ; elytris densius sat fortiter punctatis ; coxis posterioribus 

 fortiter punctatis; abdomine impunctato. Long. Z\, lat I5 m.m. 



I have seen but a single specimen of this species, and am uncertain about itssex„ 

 the front tarsi are rather broad, though the joints are not at all dilated. 



Africa, (Algoa Bay). 445. 



II. 8. — Group Htphidrini. 



Hind coxal cavities separated, quite exposed, being not at all protected by the 

 coxal processes, the apices of which are rounded t)r obtuse, and are closely ad- 

 pressed to the level of the ventral segments. 



One genus — liyphydrus — is rather widely distributed in the eastern hemisphere^ 

 and is well known by numerous species ; the other genera are all auto-genera^ 

 confined to South Africa, and very rare in collections. 



Epipleura gra- ' 

 dually nar- 

 rowed liom [ — _ _ _ DARWINHYDRUS 

 shoulder to ' ( Vide p. 373.) 

 extremity. J 



