The Hertfordshire Naturalist 2021 (Transactions of the Hertfordshire Natural History Society, Vol. 53 (1), pp. 1-84) was mailed to members in October  2021.

Contents: The beetles of Sherrardspark Wood (Dan Asaw and Stuart Warrington)

Badger road casualties in Hertfordshire (Jenny Jones)

Notes on the re-appearance of the Adonis Blue butterfly in Hertfordshire (Martin Johnson)

Composition and characteristics of a transitional flora at Rough Hills grasslands, Bayfordbury (Alla Mashanova, Bronwyn Scholes and Ian Denholm)

Some notes on geological materials used by, and which inspired, Henry Moore (Michael Howgate)

Hexton Chalk Pit – A Herts and Middlesex Wildlife Trust reserve (Ian Carle)

Hertfordshire Barbastelle Project (Chantal Helm)

Trichoptera of Hertfordshire. Life history tables – a valuable ecological tool (Ronni Edmonds-Brown)

Recorders' reports on:

  • Higher plants (Ian Denholm & Alla Mashanova)
  • Bryophytes (Agneta Burton)
  • Orthoptera (Ian Carle)
  • Geology (Michael Howgate)
  • Ants (Phil Attwell)
  • Butterflies (Andrew Wood)
  • Moths (Colin Plant)

Obituaries: Brian Sawford and Janine Tyler