| Archibald | Benson | Miss Benson's brother. |
| Howard | Benson | Miss Benson's brother. |
| Hugh | Benson | Miss Benson's brother. |
| Margery | Benson | Protagonist. An insect collector. Aka: Miss Benson. |
| Matthew | Benson | Miss Benson's brother. |
| Tobias | Benson | A reverend. Margery's father. |
| Horace | Blake | The map illustrator. The reverend. |
| Howard | Carter | An Archaeologist and Egyptologist. |
| Mr. | Clark | Mrs. Clarks's husband. |
| Mrs. | Clark | The neighbor who came to the police. |
| Nancy | Collett | Missing. The woman who killed her husband. |
| Percival | Collett | Nancy's husband. Murdered. |
| Captain | Cook | The discoverer of New Caledonia. |
| Charles | Darwin | A naturalist. |
| Emile | Deplanche | An entomologist who lived on the island from 1853 to 1897. |
| Miss | Hamilton | Miss Benson's assistant. |
| Xavier | Montrouzier | An entomologist. |
| Victoria | Pope | The consul's wife. |
| Enid | Pretty | One of Margery's applicants. |
| Perce | Pretty | Enid's husband. |
| Mr. | Rawlings | The dog. |
| Alfred | Russell Wallace | Charles Darwin's friend. |
| Bill | Sikes | A fictional character. |
| Norman | Skinner | A murderer. |
| Professor | Smith | The man Margery falls in love with. Margery's boss. |
| Wendy | Thompson | One of Miss Benson's students. |
| Dolly | Wiggs | Miss Benson's new companion. Mrs. Pope's right hand woman. |
| Peter | Wiggs | Dolly Wigg's husband. |
| Barbara | | Hazel and Lorna's maid. |
| Hazel | | Margery's aunt. Tobias's sister. |
| Lorna | | Margery's aunt. Hazel's twin sister. |
| Napoleon | | A French military and political leader. |
| Taylor | | The man who joined Margery's table. |
