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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| Wolfe, J.J. | 1899 | Migratory butterflies in south-west Cork | Journal | Ir. Nat. | Details... |
| Anon. | 1900 | Abundance of Colias edusa in Connemara | Journal | Ir. Nat. | Details... |
| Donaldson | 1900 | New England butterflies | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Hamilton, J. | 1900 | Vanessa io in Co. Down | Journal | Ir. Nat. | Details... |
| Hart, W.E. | 1900 | (Colias edusa in Ireland) | Journal | Ir. Nat. | Details... |
| Hart, W.E. | 1900 | Vanessa io in Co. Londonderry | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1900 | Irish butterflies | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Cuthbert, H.K.G. | 1901 | Abundance of Vanessa io in 1901 | Journal | Ir. Nat. | Details... |
| Grierson, P.H. | 1901 | Vanessa io in the west | Journal | Ir. Nat. | Details... |
| Hart, W.E. | 1901 | Peacock butterfly near Derry | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1901 | Vanessa io in Ulster | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1901 | Vanessa c-album in Ireland | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1901 | Vanessa io, L., in Ireland | Journal | Ent. Monthly Mag. | Details... |
| Starkey, J.S. | 1901 | Vanessa io in Sligo | Journal | Ir. Nat. | Details... |
| Ward, W.T.C. | 1901 | Vanessa io near Londonderry | Journal | Ir. Nat. | Details... |
| Anon. | 1902 | The butterflies and moths of Co. Cork | Journal | Ir. Nat. | Details... |
| Carpenter, G.H. | 1902 | Vanessa io in Co. Donegal | Journal | Ir. Nat. | Details... |
| Delap, M.J. | 1902 | Colias edusa in West Kerry | Journal | Ir. Nat. | Details... |
| Flemyng, W.W. | 1902 | Lycaea argiolus in Co. Waterford | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1902 | Late appearance of Vanessa io | Journal | Ir. Nat. | Details... |
385 references found.