On Aquatic Carnivorous Coleoptera or Dytiscide. 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; Christchurch, 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. 13 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 antennee 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 particularly 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 antennee. 
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 ; elytris fusco sub-nebulosis, crebre punctatis. 
Long. 24, lat. 14 m.m. 
Mas, major sat nitidus, antennis mediocribus, tarsis anterioribus et intermediis 
fortiter dilatatis, pectore abdomineque nigricantibus. 
Fem., minor, opaca, antennis crassis, tarsis simplicibus, pectore abdomineque 
rufescentibus. 
This species is allied to Hydroporus bistrigatus, but is smaller, and the sexual 
disparity 1s greater. 
Australia, (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. 14 m.m. 
Mas, sat nitidus, tarsis anterioribus et intermediis fortiter dilatatis, abdomine 
nigro. 
fem., fere opaca, antennis paulo crassioribus et brevioribus, tarsis simplicibus, 
-abdomine leete rufo-testaceo. 
Australia, (apparently common and widely distributed). 84. 
