IN THE NORFOLK BROADS DISTRICT. 63 
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•original list was compiled. Mr. Morley has taken this list and 
compared itwith his Suffolk list of 1899, to which someadditions 
have more recently been made. He states that fourteen 
species of Water Beetles — Hydradephaga and Palpicornia — 
occur in Suffolk which do not occur in Norfolk. Three of 
these species were taken in Suffolk for the first time in 1902, 
and as to one of these, Hydroporus bilineatus — I presume of 
Sturm, although Mr. Morley has neglected to add the author’s 
names to the species all through his list — I have been unable 
to ascertain on whose authority it was introduced. The 
species had previously only been taken in a brackish ditch 
at Deal, where it occurred once in some numbers, and I 
understand that the Suffolk record is for a specimen or 
specimens taken inland at Tostock. 
Seven of these fourteen species supposed to be peculiar to 
Suffolk have occurred in the Norfolk Broads district during 
the past season. If 50 % of Mr. Morley ’s statements as to 
the Water Beetles are wrong, how are we to credit the rest 
of the paper ? 
All that can be learnt from most of the local lists as at 
present composed is that a species has occurred in the district. 
For the purpose of learning anything as to the phenology of 
the species, or as to the influences determining their range 
of distribution, such lists are valueless, and one must set 
about the task of collecting the species systematically. 
During the past season I have found in the Broads district 
seventy-two species of Hydradephaga out of the eighty-five 
recorded for the county, and have added four other species. 
Out of the fifty-three species of Palpicornia recorded for 
Norfolk, not including the genera Sphceridium, Cercyon, 
Megasternum, and Cryptopleurum, of which the species are 
mostly more common on land, I have found thirty-six and 
have added five other species. My list, therefore, for the 
ten months, February to November, includes 117 species, 
as I have not included the Gyrinidce in my work, their mode 
of life being entirely different to that of the other two 
groups. 
I have worked out the number of species per collection 
