Butterfly Conservation
Hertfordshire and Middlesex Decad Mapping Progress 2005-2009

TL41

TL41 ~ Click on image for detailed map (please note this map is out of date)

Decad co-ordinator:

Link sections on this page . . .

	Table One ~ Key Tetrads to be visited in 2009
	Table Two ~ Species richness map
	Table Three ~ Target species

This page was last updated on

Table One ~ Key tetrads to be visited
Table One now lists the target species for each specific 2km square for 2009, based on known recording. Purple Hairstreak, and Small & Essex Skipper are poorly recorded throughout the 10km square  - Liz Goodyear (May 2009)

Tetrad (2km square)	Centered on	Target species for 2008
TL4010	Hunsdon Meads	Well recorded - Brimstone, Essex Skipper
TL4012	Hundonsbury	Brimstone, Green-veined White, Holly Blue, Large White, Small Tortoiseshell
TL4014	Widford Railway line	Brimstone, Orange Tip, Painted Lady, Peacock
TL4016	Nobland Green	Brimstone, Holly Blue, Painted Lady,
TL4018	Kettle Green	Holly Blue, Large Skipper, Painted Lady,
TL4210	Hunsdon Meads east/Eastwick	Large Skipper, Painted Lady, Small Copper
TL4212	Eastwick Moat	Large Skipper, Painted Lady
TL4214	Marshland Wood	Holly Blue, Large White, Small Tortoiseshell
TL4216	Hadham Mill	Well recorded
TL4218	Much Hadham	Large Skipper, Painted Lady, Small Tortoiseshell
TL4410	Harlow Mill	Brimstone, Green-veined White, Large White, Orange Tip, Small Tortoiseshell
TL4412	Gilston	Essex Skipper, Holly Blue, Large Skipper, Small Skipper
TL4414	Great Penny's Farm	Essex Skipper, Green-veined White, Holly Blue, Painted Lady, Small Skipper
TL4416	Allens Green	Essex Skipper, Holly Blue, Painted Lady, Small Skipper
TL4418	Danesbridge	Brimstone, Green-veined White
TL4612	Redericks Lane	Holly Blue, Large White, Orange Tip
TL4614	High Wych, west Sawbridgeworth	Large Skipper
TL4616	Trims Green	Gatekeeper, Holly Blue, Large Skipper, Large White, Meadow Brown
TL4618	Thorley Park	Well recorded - Purple Hairstreak
TL4812	Pishiobury	Well recorded - Purple Hairstreak also Small Copper and Small Heath
TL4814	Sawbridgeworth	Green-veined White
TL4816	Spellbrook	Green-veined White, Holly Blue, Large Skipper, Large White, Orange Tip, Small Tortoiseshell
TL4818	Thorley Wash	Well recorded
TL5014	east of Sawbridgeworth	no details

Table Two ~ Species Richness Grid
Table Two is a 5 x 5 grid of the tetrads (2km squares) in TL41, and shows the species richness for each tetrad based on recording in 2005 - 2008 based on known records. In 2009 there has been some adjustment to the tables as in the past the page was updated at the time of recording and errors have crept in. There are are currently two transects in TL41.

Table Three ~ Target Species - Latest update May 2009. Table Three indicates the distribution of species recorded in TL41 and the tetrads that need to be visited for specific species.

* = a record / 23 tetrads only

Species

4010

4012

4014

4016

4018

4210

4212

4214

4216

4218

4410

4412

4414

4416

4418

4612

4614

4616

4618

4812

4814

4816

4818

Total

Brimstone

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

17

Brown Argus

*

*

*

*

*

*

*

*

*

*

10

Clouded Yellow

*

*

*

*

*

*

*

*

8

Comma

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

23

Common Blue

*

*

*

*

*

*

*

*

*

*

*

11

Essex Skipper

*

*

*

*

*

5

Gatekeeper

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

22

Green-veined White

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

18

Holly Blue

*

*

*

*

*

*

*

*

*

*

*

*

13

Large Skipper

*

*

*

*

*

*

*

*

*

*

*

*

*

*

14

Large White

*

*

*

*

*

*

*

*

*

*

*

*

*

*

14

Marbled White

*

1

Meadow Brown

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

22

Orange Tip

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

19

Painted Lady

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

14

Peacock

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

22

Purple Hairstreak

*

*

*

3

Red Admiral

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

23

Ringlet

*

*

*

*

*

*

*

*

*

*

*

*

12

Small Copper

*

*

*

*

*

*

*

*

*

*

*

*

*

13

Small Heath

*

*

*

*

*

5

Small Skipper

*

*

*

*

*

*

*

7

Small/Essex Skipper

Small Tortoiseshell

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

18

Small White

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

23

Speckled Wood

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

23

White-letter Hairstreak

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

23

Total

21

14

13

20

14

16

14

14

22

17

11

19

14

16

18

15

17

12

25

20

19

14

21

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