| Date | Species | Numbers | Location | Reported by |
| 31 July 2004 | Comma | 1 | Cokeham | Ray Hamblett |
| 31 July 2004 | Holly Blue | 1 | Shoreham garden | Andy Horton |
| 31 July 2004 | Large White | few | Shoreham Town | Andy Horton |
| 31 July 2004 | Small White | few | Shoreham garden | Andy Horton |
| 31 July 2004 | Speckled Wood | 1 | Cokeham | Ray Hamblett |
| 29 July 2004 | Small Copper | N/K | Lancing Clump Meadows | Brenda Collins |
| 29 July 2004 | Small/Essex Skipper | N/K | Lancing Clump Meadows | Brenda Collins |
| 28 July 2004 | Comma | 1 | Lancing Garden | Andy Horton |
| 28 July 2004 | Gatekeeper | frequent | Adur Levels | Andy Horton |
| 28 July 2004 | Holly Blue | frequent | Everywhere | Andy Horton |
| 28 July 2004 | Large White | 40+ | Everywhere | Andy Horton |
| 28 July 2004 | Meadow Brown | frequent | Everywhere | Andy Horton |
| 28 July 2004 | Pyrausta aurata Moth | 2+ | Lancing Garden | Andy Horton |
| 28 July 2004 | Small White | frequent | Urban Areas | Andy Horton |
| 28 July 2004 | Small/Essex Skipper | frequent | Adur Levels | Andy Horton |
| 28 July 2004 | Speckled Wood | 2+ | Brooklands and Adur Levels | Andy Horton |
| 27 July 2004 | 6-spot Burnet Moth | 40+ | Mill Hill (upper) | Andy Horton |
| 27 July 2004 | Chalkhill Blue | (C) 40 | Mill Hill (lower) | Andy Horton |
| 27 July 2004 | Common Blue | N/K | Lancing Clump Meadows | Brenda Collins |
| 27 July 2004 | Common Blue | 6 | Mill Hill (upper) | Andy Horton |
| 27 July 2004 | Gatekeeper | 40+ | Mill Hill and Adur Levels | Andy Horton |
| 27 July 2004 | Holly Blue | frequent | Everywhere | Andy Horton |
| 27 July 2004 | Hummingbird Hawk-moth | 1 | Lancing Garden | Ray Hamblett |
| 27 July 2004 | Large White | 100+ | Everywhere | Andy Horton |
| 27 July 2004 | Meadow Brown | 75+ | Mill Hill and Adur Levels | Andy Horton |
| 27 July 2004 | Peacock | 2 | Adur Levels | Andy Horton |
| 27 July 2004 | Pyrausta aurata Moth | 1 | Mill Hill (lower) | Andy Horton |
| 27 July 2004 | Red Admiral | 3 | Mill Hill and Adur Levels | Andy Horton |
| 27 July 2004 | Small Heath | few | Mill Hill | Andy Horton |
| 27 July 2004 | Small Tortoiseshell | 1 | Adur Levels | Andy Horton |
| 27 July 2004 | Small White | frequent | Everywhere | Andy Horton |
| 27 July 2004 | Small/Essex Skipper | frequent | Mill Hill and Adur Levels | Andy Horton |
| 27 July 2004 | Speckled Wood | N/K | Lancing Clump | Brenda Collins |
| 27 July 2004 | Wall Brown | 2 | Mill Hill (upper) & Adur Levels | Andy Horton |
| 26 July 2004 | Comma | 1 | Lancing Garden | Ray Hamblett |
| 26 July 2004 | Large White | 25+ | Shoreham Town | Andy Horton |
| 26 July 2004 | Pyrausta aurata Moth | 1 | Shoreham Garden | Andy Horton |
| 26 July 2004 | Small White | few | Shoreham Town | Andy Horton |
| 25 July 2004 | 6-spot Burnet Moth | 5+ | Slonk Hill South | Andy Horton |
| 25 July 2004 | Comma | 2 | Slonk Hill South & Shoreham Town | Andy Horton |
| 25 July 2004 | Gatekeeper | 25+ | Slonk Hill South | Andy Horton |
| 25 July 2004 | Holly Blue | 15+ | Slonk Hill South | Andy Horton |
| 25 July 2004 | Large White | 25+ | Slonk Hill South & Shoreham Town | Andy Horton |
| 25 July 2004 | Meadow Brown | 20+ | Slonk Hill South | Andy Horton |
| 25 July 2004 | Small Blue | 2 | Slonk Hill South | Andy Horton |
| 25 July 2004 | Small White | 25+ | Slonk Hill South & Shoreham Town | Andy Horton |
| 25 July 2004 | Small/Essex Skipper | 10+ | Slonk Hill South | Andy Horton |
| 25 July 2004 | Speckled Wood | 2 | Slonk Hill South | Andy Horton |
| 24 July 2004 | 6-spot Burnet Moth | 15+ | Mill Hill | Andy Horton |
| 24 July 2004 | Chalkhill Blue | (D) 80 | Mill Hill (lower) | Andy Horton |
| 24 July 2004 | Comma | 1 | Shoreham Town | Andy Horton |
| 24 July 2004 | Common Blue | 10+ | Mill Hill | Andy Horton |
| 24 July 2004 | Gatekeeper | 25+ | Mill Hill | Andy Horton |
| 24 July 2004 | Holly Blue | 1 | Mill Hill | Andy Horton |
| 24 July 2004 | Large White | (E) 75+ | Mill Hill and Shoreham Town | Andy Horton |
| 24 July 2004 | Marbled White | 8 | Mill Hill | Andy Horton |
| 24 July 2004 | Meadow Brown | 15+ | Mill Hill | Andy Horton |
| 24 July 2004 | Peacock | 1 | Adur Levels (Saltings Field, Botolphs) | Jan Hamblett |
| 24 July 2004 | Small Heath | few | Mill Hill | Andy Horton |
| 24 July 2004 | Small White | 20+ | Mill Hill and Shoreham Town | Andy Horton |
| 24 July 2004 | Small/Essex Skipper | 15+ | Mill Hill | Andy Horton |
| 24 July 2004 | Speckled Wood | few | Mill Hill scrubland | Andy Horton |
| 23 July 2004 | 6-spot Burnet Moth | 1 | Slonk Hill South | Andy Horton |
| 23 July 2004 | Gatekeeper | (E) 50+ | Slonk Hill South & Adur Levels | Andy Horton |
| 23 July 2004 | Holly Blue | few | Slonk Hill South | Andy Horton |
| 23 July 2004 | Large White | (E) 50+ | Shoreham Town & Adur Levels | Andy Horton |
| 23 July 2004 | Marbled White | 1 | Adur Levels | Andy Horton |
| 23 July 2004 | Meadow Brown | frequent | Slonk Hill South & Adur Levels | Andy Horton |
| 23 July 2004 | Red Admiral | 2 | Adur Levels | Andy Horton |
| 23 July 2004 | Small Tortoiseshell | 1 | Adur Levels | Andy Horton |
| 23 July 2004 | Small White | frequent | Shoreham Town & Adur Levels | Andy Horton |
| 23 July 2004 | Small/Essex Skipper | frequent | Shoreham Town & Adur Levels | Andy Horton |
| 22 July 2004 | 6-spot Burnet Moth | 1 | Adur Levels | Andy Horton |
| 22 July 2004 | Comma | few | Adur Levels (Upper Beeding) | Andy Horton |
| 22 July 2004 | Gatekeeper | 25+ | Adur Levels | Andy Horton |
| 22 July 2004 | Green-veined White | few | Adur Levels (Saltings Field, Botolphs) | Andy Horton |
| 22 July 2004 | Holly Blue | few | Adur Levels | Andy Horton |
| 22 July 2004 | Large White | 25+ | Adur Levels | Andy Horton |
| 22 July 2004 | Marbled White | 1 | Adur Levels | Andy Horton |
| 22 July 2004 | Meadow Brown | 10+ | Adur Levels | Andy Horton |
| 22 July 2004 | Peacock | few | Adur Levels (Upper Beeding) | Andy Horton |
| 22 July 2004 | Red Admiral | few | Adur Levels (Upper Beeding) | Andy Horton |
| 22 July 2004 | Small Tortoiseshell | few | Adur Levels (Botolphs) | Andy Horton |
| 22 July 2004 | Small White | few | Adur Levels | Andy Horton |
| 22 July 2004 | Small/Essex Skipper | 15+ | Adur Levels | Andy Horton |
| 21 July 2004 | 6-spot Burnet Moth | 2+ | Adur Levels and Anchor Bottom | Andy Horton |
| 21 July 2004 | Comma | 1 | Adur Levels | Andy Horton |
| 21 July 2004 | Gatekeeper | 40+ | Adur Levels | Andy Horton |
| 21 July 2004 | Holly Blue | 2 | Adur Levels | Andy Horton |
| 21 July 2004 | Large White | 40+ | Adur Levels | Andy Horton |
| 21 July 2004 | Marbled White | 2 | Anchor Bottom (Dacre) | Andy Horton |
| 21 July 2004 | Meadow Brown | 20+ | Adur Levels | Andy Horton |
| 21 July 2004 | Red Admiral | 2 | Adur Levels | Andy Horton |
| 21 July 2004 | Small Tortoiseshell | 2 | Botolphs | Andy Horton |
| 21 July 2004 | Small White | > 5 | Adur Levels | Andy Horton |
| 21 July 2004 | Small/Essex Skipper | 15+ | Adur Levels | Andy Horton |
| 20 July 2004 | 6-spot Burnet Moth | 12+ | Lancing Clump Meadows | Andy Horton |
| 20 July 2004 | Chalkhill Blue | 2 | Southwick Hill | Allen Pollard |
| 20 July 2004 | Gatekeeper | 25+ | Lancing Clump Meadows | Andy Horton |
| 20 July 2004 | Holly Blue | 1 | Lancing Garden | Andy Horton |
| 20 July 2004 | Large White | 40+ | Lancing Clump Meadows and Town | Andy Horton |
| 20 July 2004 | Marbled White | 4 | Lancing Clump Meadows | Andy Horton |
| 20 July 2004 | Meadow Brown | 12+ | Lancing Clump Meadows | Andy Horton |
| 20 July 2004 | Pyrausta aurata Moth | 1 | Lancing Garden | Andy Horton |
| 20 July 2004 | Red Admiral | 1 | Lancing Clump | Andy Horton |
| 20 July 2004 | Small White | 10+ | Town and Countryside | Andy Horton |
| 20 July 2004 | Small/Essex Skipper | 15+ | Lancing Clump Meadows | Andy Horton |
| 19 July 2004 | 6-spot Burnet Moth | 40+ | Mill Hill | Andy Horton |
| 19 July 2004 | Chalkhill Blue | (C) 33 | Mill Hill (lower) | Andy Horton |
| 19 July 2004 | Gatekeeper | 100+ | Shoreham Town and Mill Hill | Andy Horton |
| 19 July 2004 | Holly Blue | 1 | Mill Hill (upper) | Andy Horton |
| 19 July 2004 | Holly Blue | 4 | Shoreham Town | Andy Horton |
| 19 July 2004 | Large White | 30+ | Shoreham Town and Mill Hill | Andy Horton |
| 19 July 2004 | Marbled White | (C) 22 | Mill Hill (upper) | Andy Horton |
| 19 July 2004 | Meadow Brown | 30+ | Mill Hill | Andy Horton |
| 19 July 2004 | Peacock | 1 | Adur Levels | Andy Horton |
| 19 July 2004 | Pyrausta nigrata Moth | 2 | Mill Hill (lower) | Andy Horton |
| 19 July 2004 | Red Admiral | 1 | Adur Levels | Andy Horton |
| 19 July 2004 | Silver Y Moth | 1 | Mill Hill (upper) | Andy Horton |
| 19 July 2004 | Small Heath | 2 | Mill Hill | Andy Horton |
| 19 July 2004 | Small Tortoiseshell | 3 | Shoreham Town and Adur Levels | Andy Horton |
| 19 July 2004 | Small White | > 20 | Shoreham Town | Andy Horton |
| 19 July 2004 | Small/Essex Skipper | 70+ | Shoreham Town, Mill Hill and Adur Levels | Andy Horton |
| 19 July 2004 | Speckled Wood | 1 | Mill Hill (upper) | Andy Horton |
| 18 July 2004 | Gatekeeper | 60+ | Slonk Hill South | Andy Horton |
| 18 July 2004 | Holly Blue | 3 | Slonk Hill South | Andy Horton |
| 18 July 2004 | Holly Blue | 1 | Shoreham Town | Andy Horton |
| 18 July 2004 | Large White | > 15 | Shoreham Town | Andy Horton |
| 18 July 2004 | Meadow Brown | 20+ | Slonk Hill South | Andy Horton |
| 18 July 2004 | Red Admiral | 2 | Slonk Hill South | Andy Horton |
| 18 July 2004 | Small Blue | 1 | Slonk Hill South | Andy Horton |
| 18 July 2004 | Small White | few | Shoreham Town | Andy Horton |
| 18 July 2004 | Small/Essex Skipper | 50+ | Slonk Hill South | Andy Horton |
| 17 July 2004 | Green-veined White | 2 | Adur Recreation Ground | Andy Horton |
| 17 July 2004 | Large White | 1 | SE of Toll Bridge | Andy Horton |
| 17 July 2004 | Meadow Brown | few | Malthouse Meadows | Ray Hamblett |
| 17 July 2004 | Small Copper | 2 | Malthouse Meadows | Ray Hamblett |
| 17 July 2004 | Small Skipper | few | Malthouse Meadows | Ray Hamblett |