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This website provides information on butterflies reported in the Stevenage area since 1993. The reports are based on records submitted by observers for the area encapsulated in the Ordnance Survey grid reference TL22 10km decad which includes villages Walkern and Great Wymondley, for example. I am most indebted to Andrew Wood, the county butterfly recorder, for supplying the records and a big thank you to all the recorders without which this project would have been possible. Records for 1993 and 1994 relate to my transect only covering the southern section of Fairlands Valley Park.
Distribution maps are taken from the MapMate database onto which the TL22 data had been applied. The distribution for most species is represented at 2km level (tetrad) as is standard for county distribution maps. However, for the more local species I felt it more appropriate to represent their distributions down to 1km (monad). About 1% of records are not accurate at the 1km level so these are excluded on the map. In addition, the margin of human error is wider at the 1km level so this should be borne in mind when analysing these maps. Presence of a particular species in either tetrad or monad is depicted by an orange square. For tetrads two additional features are shown. The darker the square, the more records submitted but this does not necessarily mean increased abundance. Squares ringed with blue indicate reports since 2010.
Abundance charts refer to timed or monitored visits only like transects and walks undertaken for the Wider Countryside Butterfly Survey otherwise to discern trends would be meaningless. The Big Butterfly Count records are not being counted because the scheme was initiated only in 2010 but references to it are noted for any significant sightings.
I had considered using all data for phenology (flight period) charts but there appears to be a proportionately large number of records for late July and August (the school summer holidays) and of course the Big Butterfly Count scheme takes place during this period. Transect data only is used for preparing phenology charts except for the rarer species where phenology might be better represented for a wider area, for example, the TL22 decad as a whole.
Only species which were reported since 1995 and those seen on the Stevenage transect since 1993 are described. The one exception is the Brown Hairstreak, with unconfirmed reports from Norton Green. Those species, excluding migrants, not believed to hold colonies in the Stevenage area are highlighted in red on the left.
To find out more on species in general refer to the 'Species Accounts' webpage or click on the species you are interested in, on the left.
I must thank Ian Carle, Jenny Oxley, Bob Press and Jo Ward for allowing me to have access to records and collections at the Herts Environmental Records Centre (HERC) at Grebe House, St Albans, Mill Green Museum at Hatfield, Hitchin Museum and Stevenage Museum respectively. I am grateful to Bob Clift for his help and checking my web pages on his Mac.
Photographs on this website were taken by me unless otherwise stated.
If you wish to make comments regarding content on the website or anything else please email me or submit details on the 'Contact' webpage.
20 Aug - Brown Hairstreaks at Mardley Heath?
19 Aug - Another Comma pupa
17 Aug - Clouded Yellow
14 Aug - Comma pupa
13 Aug - Dark Green Fritillary
11 Aug - Brown Argus and Small Heath
10 Aug - 'White' Gatekeeper
6 Aug - Knebworth transects week 19
5 Aug - Stevenage transect week 19
4 Aug - Brown Hairstreaks
1 Aug - Peacocks and Brown Argus
31 Jul - Stevenage transect week 18
30 Jul - Very few Peacocks
26 Jul - Brown Argus aberration
25 Jul - Stevenage transect week 17
22 Jul - Silver-washed on knapweed
20 Jul - Gatekeeper now top dog
18 Jul - Already on the wane
13 Jul - White Admiral at Norton Green
11 Jul - Comma larva
8 Jul - 17 species at Knebworth
7 Jul - Chalkhill Blues
4 Jul - Purple Emperor hot-spot?
1 Jul - Second brood Small Coppers
30 Jun - More Purple
29 Jun - Purple Hairstreak on the rise
26 Jun - Another Purple day
24 Jun - Silver-washed
23 Jun - First Purple Hairstreak
21 Jun - Purple Emperors
19 Jun - Early White letters
18 Jun - Century at Stevenage
17 Jun - First century of the year
15 Jun - White letter again
14 Jun - White-letter Hairstreaks
13 Jun - Marbled White and Ringlet
11 Jun - Purple Emperor in Surrey
10 Jun - Brampton Wood
8 Jun - Unusual Common Blue
4 Jun - First Large Skippers
3 Jun - First Meadow Brown
2 Jun - Small Tortoiseshell
1 Jun - Chapelfoot
31 May - Stevenage transect week 9
28 May - Knebworth transects week 9
26 May - Bison Hill
23 May - First Small Heath
21 May - Knebworth transects week 8
20 May - Common Blues now flying
16 May - Holly Blue on Dogwood
14 May - Transects week 7
10 May - Stevenage transect week 6
7 May - Knebworth transects week 6
4 May - First Small Copper
2 May - Stevenage transect week 5
28 Apr - Hexton Chalk Pit
27 Apr - Hoverfly at Whomerley Wood
25 Apr - Orange Tip eggs
22 Apr - Stevenage transect week 4
19 Apr - Dukes in Bedfordshire
18 Apr - More like it!
15 Apr - Rain at last!
12 Apr - Public rights of way at Knebworth Park
11 Apr - Peacock and Small Tortoiseshell eggs
9 Apr - Wonderful weather but ...
8 Apr - Grizzled at Frogmore
6 Apr - 3 Firsts!
5 Apr - My first Orange Tip
4 Apr - Comma egg
3 Apr - Another Large Tortoiseshell in Sussex
28 Mar - Large Tortoiseshell in Sussex
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