Brimstone
Brown Argus
Brown Hairstreak
Chalkhill Blue
Clouded Yellow
Comma
Common Blue
Dark Green Fritillary
Dingy Skipper
Essex Skipper
Gatekeeper
Green Hairstreak
Green-veined White
Grizzled Skipper
Holly Blue
Large Skipper
Large White
Marbled White
Meadow Brown
Orange-tip
Painted Lady
Peacock
Purple Emperor
Purple Hairstreak
Red Admiral
Ringlet
Silver-washed Fritillary
Small Blue
Small Copper
Small Heath
Small Skipper
Small Tortoiseshell
Small White
Speckled Wood
Wall
White Admiral
White-letter Hairstreak
Extinct/rare immigrants
Brown Argus
Brown Hairstreak
Chalkhill Blue
Clouded Yellow
Comma
Common Blue
Dark Green Fritillary
Dingy Skipper
Essex Skipper
Gatekeeper
Green Hairstreak
Green-veined White
Grizzled Skipper
Holly Blue
Large Skipper
Large White
Marbled White
Meadow Brown
Orange-tip
Painted Lady
Peacock
Purple Emperor
Purple Hairstreak
Red Admiral
Ringlet
Silver-washed Fritillary
Small Blue
Small Copper
Small Heath
Small Skipper
Small Tortoiseshell
Small White
Speckled Wood
Wall
White Admiral
White-letter Hairstreak
Extinct/rare immigrants
References
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12 Sep - Stevenage week 24
7 Sep - Knebworth week 23
6 Sep - Stevenage week 23
4 Sep - Red Admiral
30 Aug - Knebworth week 22
28 Aug - WCBS
27 Aug - Stevenage week 22
25 Aug - Knebworth week 21
19 Aug - Stevenage week 21
18 Aug - Knebworth week 20
17 Aug - Astonbury Wood
13 Aug - Stevenage week 20
9 Aug - Knebworth woods week 19
7 Aug - Knebworth Park week 19
5 Aug - Stevenage week 19
1 Aug - Knebworth week 18
30 Jul - Garden Brimstone
29 Jul - Stevenage week 18
28 Jul - Jersey Tigers & Big Butterfly Count
26 Jul - WCBS Aston
24 Jul - Knebworth week 17
23 Jul - Stevenage week 17
22 Jul - First new-brood Peacock
20 Jul - Immature individuals on hop in garden
19 Jul - Stevenage week 16
17 Jul - Knebworth week 16
11 Jul - Knebworth week 15
10 Jul - Stevenage week 15
4 Jul - Knebworth week 14
2 Jul - First Small Skippers of the year
1 Jul - Stevenage week 14
29 Jun - Knebworth week 13
24 Jun - Stevenage week 13
22 Jun - White-letter Hairstreaks at Six Hills Common
20 Jun - Knebworth week 12
17 Jun - Stevenage week 12
16 Jun - Knebworth week 11
13 Jun - Stevenage week 11
9 Jun - Knebworth week 10
7 Jun - Stevenage week 10
2 Jun - Knebworth week 9
29 May - Stevenage week 9
25 May - Knebworth week 8
20 May - Stevenage week 8
19 May - Knebworth week 7
13 May - Stevenage week 7
12 May - Small Heath
10 May - Knebworth week 6
9 May - Astonbury Wood
8 May - WCBS Aston
7 May - Stevenage week 6
5 May - Large White
1 May - Stevenage week 5
30 Apr - Knebworth week 5
29 Apr - Stevenage week 5
18 Apr - Stevenage week 3
12 Apr - Knebworth week 2
8 Apr - 4 Firsts of the year
6 Apr - Fairlands Valley Park
5 Apr - Species accounts updated - UKBMS
4 Apr - Small White
2 Apr - Knebworth woods week 1
1 Apr - Orange-tip Knebworth Park
30 Mar - Langley & Norton Green
26 Mar - Stevenage week 0
24 Mar - First Comma of the year
20 Mar - First Brimstone of year
14 Mar - First Peacocks of year
8 Mar - First butterfly of year - Red Admiral
6 Mar - Species accounts updated
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