670 
MR. F. BALFOUR BROWNE ON A 
Aeschna isosceles , an insect confined to the fen districts, 
appeared aboirt the middle of June and was common enough 
for about a month, its place being then taken by Aeschna grandis, 
Avhich was about until the first or second week in September. 
Oiihetrum cancellation and Lihellula fulva were about in July, 
and both, I believe, appeared some time at the end of June. The 
former species which was very common round Sutton and Barton 
and Ranworth, and perhaps elsewhere, seemed to disappear suddenly 
about the beginning of August, although I found one or two 
specimens much later. 
Sympetrum stnolatum I first recorded on July 16 th, after which 
it became very common and was to be found fairly abundantly 
during the first fortnight of October. 
Aeschna juncea I did not find until August 19th, although 
I heard of its occurrence at the end of July. 
I will now pass on to the Zygopterids — the small thin-bodied 
Dragon-flies of which nymphs, at least of some species, are 
common, and the perfect insects are easily captured. There are 
only fifteen species of these Dragon-flies found in Britain, and of 
these the Victoria County History records nine as being found in 
Norfolk. Of these nine I have only found six, but I have been 
able to add four more to that list and therefore my facts as to 
distribution concern only ten species. 
Only one of these ten species is cosmopolitan in the district, and 
it is apparently common enough everywhere. This species is 
Ischnura elegans and was on the wing during the whole season, 
that is from May until October. 
Another species, Agrion pulchellum , may later on prove to be 
generally distributed, but it is not uniformly common, apparently 
having its centre in the eastern half of the district, while another 
species of the same genus, Agrion puella, predominates in the 
western half. This latter species, during last season, had two 
particularly crowded centres, one at the west end of Barton Broad 
and the other on the west side of Wroxham Broad. I only took 
one specimen of this latter species at Sutton and one at Calthorpo, 
both, curiously enough, on the same day. It does not appear to 
occur at all in any of the other eastern sub-districts. 
The records of these two species stand entirely upon the 
collection of perfect insects, as so far I have been unable to 
distinguish between the nymphs. 
