On Aquatic Carnivorom Coleoptera or Dytiscidce. 361 



larger and more distinctly punctured than those sent by Capt. Broun : the 

 specimens from the Southern Island also depart considerably from the type in 

 some of the details, and possibly there may prove to be more than one species. 



New Zealand, (North Island, Capt. T. Broun and R. Lawson ; Cliristchurch, Wakefield ; Otago, 

 Prof. Hutton). 83. 



297. Bidessus huttoni, n. sp. — Oblongo-ovalis, supra testaceus, subtus nigricans; 

 -elytris versus suturam vix fortiter punctatis ; prothoracis lateribus subparallelis. 

 Long. 3, lat. I3 m.m. 



The male is moderately shining on the wingcases, and has the front and middle 

 tarsi but little dilated. The female has the upper surface dull, and the elytra 

 rather shorter and broader than in the male, and its antennae are stouter. 



Although very similar to B. plicatus, the two species are easily distinguished 

 when the corresponding sexes are compared ; the male of B. huttoni has the 

 anterior and j^articularly the middle tarsi almost without dilatation, and can thus 

 be distinguished from the corresponding sex of B. plicatus ; while the female of B. 

 huttoni, is readily recognised by its dull upper surface and incrassate antennae. 



New Zealand, (Otago, a pair sent by Prof. Hutton in 1877). 1127. 



298. Hydroporus shuckhardi, Clk., M.C — Oblongo-ovalis, capite thoraceque rufo- 

 testaceis, sparsim obsoleteque punctatis ; el3ftris fusco sub-nebulosis, crebre punctatis. 

 Long. 2i, lat. Ij m.m. 



Mas, major sat nitidus, autennis mediocribus, tarsis anterioribus et intermediis 

 fortiter dilatatis, pectore abdomineque nigricantibus. 



Fern., minor, opaca, antennis crassis, tarsis simplicibus, pectore abdomineque 

 rufescentibus. 



This species is allied to Hydroporus bistrigatus, but is smaller, and the sexual 

 disparity is greater. 



Aiistralia, (from Melbourne to Queensland, but apparently rare). 85. 



299. Hydroporus bistrigatus, Clk., M.C. — Oblongo-ovalis, elytris dense sub- 

 tilissime punctatis, pone medium fusco-nebulosis ; pectore nigerrimo ; coxis 

 posterioribus sparsim distincte punctatis. Long. 3, lat. \\ m.m. 



Mas, sat nitidus, tarsis anterioribus et intermediis fortiter dilatatis, abdomine 

 nigro. 



Fern., fere opaca, antennis paulo crassioribus et brevioribus, tarsis simplicibus, 

 abdomine lagte rufo-testaceo . 



Australia, (apparently common and widely distributed). 84. 



