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THE ZOOLOGY OF NORFOLK 47 
but Hydrophilus piceus is much more local in its distribution; on the 
floating leaves of water lilies, species of the Genus Donacia are frequently 
seen, e.g. Sutton Broad. Some 2,100 species of beetles have been recorded 
for the county. 
Hymenoptera (Ants, Bees, Wasps, etc.).—-Norfolk has been very 
fortunate in having a number of very enthusiastic workers upon the various 
groups of Hymenoptera over a large number of years, resulting of the 
enumeration of an extensive list of species being recorded. 
Phytophagus Hymenoptera (Saw-flies)—Mr. J. B. Bridgman chiefly 
working in the neighbourhood of Norwich, with the assistance of his 
co-workers, Rev. E. N. Bloomfield and Mr. E. A. Atmore in other parts 
of the county, recorded a list of 211 species, including many of rare 
occurrence (Trans. N. N. Nat. Soc. 1908-1909) ; 17 further species were 
subsequently added. 
Aculeate Hymenoptera (Wasps, Bees and Ants).—Bridgman was also 
responsible for the listing of a very large proportion of this group and 
also for the Chrysidide of the county ; his extensive collection may be 
consulted in the Castle Museum. 
The Parasitic Hymenoptera (Ichneumons, etc.).—T hese also came under 
the notice of Bridgman who published a list of no fewer than 616 British 
species. Mr. Claude Morley, the authority upon the British Ichneumonidae, 
made further additions with the result that in Trans. N. N. Nat. Soc. 
1912-1913, he states that the total number now known in Norfolk is 675, 
a number at present exceeded by no published county list ; the number 
of kinds indigenous to Britain is 1,517. Other parasitic Hymenoptera 
(Braconide, Chalicide, etc.) have received practically no attention in the 
county. 
Diptera —The Rev. E. N. Blomfield made a great study of the Norfolk 
and Suffolk Diptera during a long life of eighty-six years, and only a few 
days before his death handed over his notes and MSS. to Mr. Claude 
Morley and Mr. E. A. Atmore with a request that they should be published 
in the Transactions of the Norfolk and Norwich Naturalists’ Society. 
_ The account occupies 180 pages to the Supplement to vol. x, Part 1, and it 
is a tribute to his energy that some 1,828 species were recorded for Norfolk 
out of about 3,000 given for Britain. 
Culicide (Mosquitoes),—In connection with the close relationship 
known to exist between many blood-sucking insects and the transference 
of certain diseases to man and animals, Dr. Sidney Long commenced to 
make a list of the mosquitoes occurring in the county and recorded some 
8 species with their distribution ; in time he hopes to make additions to 
the list. 
MOLLusca, 
Marine Mollusca——Comparatively few marine species are represented 
immediately off the Norfolk coasts owing to the shifting and disturbed 
sandy floor. At the mouths of rivers where mud is deposited, one finds 
beds of Mactra stultorum, Tapes pullastra, Nucula nucleus, and where 
similar contributions of silt obtain in localities like Holkham Bay, the 
Razors (Solen ensis and S. siliqua), Spisula solida, Lucina borealis, Pecten 
