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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| Crawford, W.M. | 1921 | An aberration of Argynnis aglaia | Journal | Ir. Nat. | Details... |
| Donisthorpe, H.St.J. | 1921 | Gymnetron squamicolle Reitter, a beetle new to the Britannic list | Journal | Ir. Nat. | Details... |
| Dublin Microscopical Club | 1921 | Dublin Microscopical Club | Journal | Ir. Nat. | Details... |
| Dublin Microscopical Club | 1921 | Dublin Microscopical Club | Journal | Ir. Nat. | Details... |
| Greer, T. | 1921 | Sesia formicaeformis, a correction | Journal | Ir. Nat. | Details... |
| Greer, T. | 1921 | Argynnis aglaia in Co. Tyrone | Journal | Ir. Nat. | Details... |
| Greer, T. | 1921 | Oxigrapha literana in north of Ireland | Journal | Ent. | Details... |
| Greer, T. | 1921 | Pyrameis cardui and P. atalanta in east Tyrone | Journal | Ent. | Details... |
| Greer, T. | 1921 | Vanessidae, etc., in east Tyrone in 1921 | Journal | Entomol. Rec. J. Var. | Details... |
| Johnson, W.F. | 1921 | Notes on Lepidoptera in 1920 | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1921 | Some Irish Hymenoptera Aculeata | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1921 | The distribution of Argynnis aglaia in Ireland | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1921 | Irish Hymneoptera Aculeata: some corrections | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1921 | Irish Ichneumonidae and Braconidae in 1920 | Journal | Ir. Nat. | Details... |
| Johnson, W.F. | 1921 | Abundance of red admiral butterflies | Journal | Ir. Nat. | Details... |
| Langham, C. | 1921 | Notes on Lepidoptera | Journal | Ir. Nat. | Details... |
| Morley, C. | 1921 | British Ichneumons: additions and confirmations | Journal | Ent. Monthly Mag. | Details... |
| Phibbs, G.B. | 1921 | Variations in the segmental spines of the fourth-stage larva of Hypoderma bovis | Journal | Ir. Nat. | Details... |
| Phillips, R.A. | 1921 | Nests of the ant Stenamma westwoodi, discovered in Ireland | Journal | Ir. Nat. | Details... |
| Phillips, R.A. | 1921 | Donisthorpea mixta and D. umbrata, two ants new to Ireland | Journal | Ir. Nat. | Details... |
4097 references found.