IN THE NORFOLK BROADS DISTRICT. 8 l 
of the species of llydradephaga in three cases, those of 
Hydroporus pictus, H. granular is, and II. gyllenhalii, and the 
following table, in which only species showing a plus value 
and which occurred in more than i % of all collections are 
included, is the result : — 
rABLE SHOWING THOSE SPECIES WHICH ARE ASSOCIATED 
WITH HYDROPORUS PICTUS, GRANU LARIS AND GYLLENHALII. 
F. 
Hydroporus 
GRANULARIS, L. 
Hydroporus 
Gyllenhalii, Schiodte. 
75 
Ilybius guttiger 
55 
Hydroporus tristis 
100 
Hydroporus oblongus - 
5 ° 
,, pubescens 
65 
67 
,, erylhrocephalus 
44 
,, neglectus 
61 
,, umbrosus 
40 
Agabus chalconotus - 
54 
63 
,, angustatus 
,, bipustulatus - 
45 
60 
,, memnonius 
Hydroporus nigrita - 
30 
57 
„ mgrita - 
k 
33 
,, memnonius 
27 
45 
H ydaticus 
Copelatus agilis 
25 
44 
transversalis - 
Agabus unguicularis "i 
Copelatus agihs ■ 
28 
Ilybius guttitrer - > 
18 
Hydroporus vittula 
27 
Dytiscus punctulatus J 
,, pubescens 
23 
Hydroporus vittula 
17 
J J 
Haliplus variegatus t 
Hydroporus 1 
33 
Agabus unguicu laris J 
granularis J- 
9 
32 
Hydroporus dorsalis - 
20 
,, umbrosus 
Bidessus unistriatus ) 
Ilybius ater 
8 
2 5 
Rhantus grapii - / 
*7 
,, obscurus 
7 
22 
Hydroporus obscurus \ 
Hydroporus "1 
Ilybius obscurus J 
1 j 
angustatus > 
5 
Haliplus fulvus - 
12 
,, planus - J 
,, ruficollis 
Ccelambus 
iS 
Noterus clavicornis 
impressopunctatus - 
2 
Ccelambus 
17 
impressopunctatus 
L 
1 1 
Hydroporus 
gyllenhalii 
7 
Colymbetes fuscus 
5 
Hydroporus lineatus - 
10 
,, palustris - 
9 
,, neglectus - 
8 
Rhantus exoletus 
7 
Ilybius ater - \ 
ft 
Dytiscus punctulatus J 
Agabus bipustulatus | 
,, nebulosus J 
5 
Haliplus obliquus 
4 
Hydroporus planus - 
2 
Haliplus confinis 
I 
Iydroporus Pictus, F. 
nemidotus impressus 
oelambus versicolor I 
[ydaticus 
transversalis - 
laliplus ruficollis 
•eronectes assimilis - 
accophilus interruptus 
laliplus fulvus 
Iydroporus palustris - 
laliplus obli(|uus \ 
Iydroporus lepidus } 
lyphydrus ovatus \ 
oelambus imequalis J 
laliplus confinis 
accophilus obscurus - 
laliplus flavicollis \ 
,, lineatocollis I 
Iydroporus lineatus - 
.hantus grapii - ^ 
idessus unistriatus J 
Iydroporus \ 
angustatus [■ 
,, erythrocephalus j 
loterus sparsus - 
laliplus variegatus \ 
ihantus -exoletus J 
lybius obscurus 
„ ater 
VOL. VIII 
G 
