in other parts of Australia. As for the varieties only 6 of the 21 
from S.W. Australia are found elsewhere in Australia. 
PART VIII. — DYTISCIDA E, GYRINIDAE, and HYDRO- 
PHILIDAE. 
By Dr. M. Regimbart, of Evreux. 
Pp. 311-316. 
To the list and the descriptions of the S.W. Australian 
water-beetles the author has added the description of a new 
species from Tasmania and Victoria, viz., Philhydrus persimilis. 
The following list enumerates tire species of the present collection. 
DYTISCIDAE. 
N ectero'soma peniallatum (Clark). — Rottnest in a salt lake ; in 
the Avon, Beverley. 
Antiporus femoralis (Boh.). — Busselton, in the Vasse ; Albany, in 
a freshwater lagoon. 
Macropoms howitti (Clark).— Monger’s Lake. 
,, dilatatus, n. sp. — Monger’s Lake. 
Parostev michaelseni, n. sp. — Boorabbin, in a small freshwater 
pool on the top of a granite rock. 
Bidessus bistrigatus (Clark). — Yalgoo, in pools in the almost dried 
bed of a small creek. 
,, biformis (Sharp). — Albany, in a freshwater pool. 
,, shuckardi (Clark). — Broome Hill, in a stream. 
Rhantus pulverosus (Steph.), var. australis (Aube) = conspersus 
(Gyll.) 3 — Monger’s Lake. 
,, simulans, n. sp. — Albany, in a freshwater pool. A 
specimen in the author’s collection at the British 
Museum is from the Swan River. 
Hyderodes shuckardi (Hope). — Northampton, in a stream ; Eradu, 
in a pool in the nearly dried up bed of the Green- 
ough River. 
Cybister tripunctatus (H.) . — Monger’s Lake. 
GYRINIDAE. 
Macrogyrus angustatus (Reg.). — Jarrahdale, in calmer oxbows ot 
a stream ; Pinjarrah, in the Murray River ; Serpentine, in 
the Serpentine River ; Brunswick, in a small stream. 
HYDROPHILIDAE. 
Hydrotrephis master si (Macl.).' — Monger's Lake ; Mundijong, in the 
water of a trench ; Bunbury, in a freshwater pool. This 
species may be the same as Hydrophilus semicylindricus 
(Eschsch.), from the Sandwich Islands. 
Hydrobius hartmeyeri ,n. sp. — Gooseberry Hill, in a small stream. 
Helochares tenuistriatus, n. sp. — Monger’s Lake. 
Philhydrus temporalis, n. sp. — Beverley, in the Avon. 
