HANTS & SURREY BORDER DRAGONFLY GROUP
       ______________________________________________      

    Formed in 1989 to record the local Dragonfly species.      

    The area chosen for the main research effort was a
    block of 16 ten-kilometre squares giving some overlap
    into Surrey and Berkshire.      

                      SU      

               66   76   86   96      

               65   75   85   95      

               64   74   84   94      

               63   73   83   93      

    A considerable amount of land is owned by the M.O.D.
    which provides some conservation possibilities.
    Considerable mineral extraction has taken place in the
    area providing extra waterbodies for the expansion of
    the Dragonfly population.      

    The area has several rivers and the Basingstoke Canal
    which has been the subject of much research following
    the re-opening to boat traffic.The Canal has a basic
    problem with its water supply and as a result for much
    of the year the locks remain closed to traffic.The water
    is possibly reducing in quality and observation of the
    more sensitive Dragonfly species seems to confirm this.
    There seems to be a shift in species out of Hampshire,
    where nearly all the water is above Ash Lock,into
    the Surrey section,which has many locks.      

    The area also contains the prime site for Dragonflies
    in the United Kingdom.Thursley National Nature Reserve
    has some 26 species on a regular basis and can host
    immigrants,if they can be found in such a large site.
    The White-faced Darter has a tenuous hold on its only
    remaining southern site on this reserve.          

	1.  Gomphus vulgatissimus                              27   to  30 mm
	2.  Brachytron pratense                                    35   to  40 mm
	3.  Leucorrhinia dubia                                         18   to  20 mm
	4.  Orthetrum coerulescens                               17   to  23 mm
	5.  Orthetrum cancellatum                               23   to  25.5mm
	6.  Anax imperator                                            45   to  56 mm
	7.  Libellula depressa                                        22   to 25 mm
	8.  Libellula quadrimaculata                           22   to  26 mm
	9.  Aeshna cyanea                                           38   to 48 mm
	10. Aeshna mixta                                              30   to  38 mm
	11. Sympetrum danae                                       14   to  16 mm