| Pheidole williamsi | MCZ | 1923-04-21 19:00:00 | South Seymor Island |
| Pheidole williamsi | CAS | 1905-10-31 19:00:00 | Indefatigable Island [Santa Cruz Island] |
| Pheidole williamsi | MCZ | 1905-10-31 19:00:00 | Indefatigable Island (=Santa Cruz Island) |
| Pheidole williamsi | CAS | 2006-04-28 19:00:00 | Isabela, V. Wolf; Pega Pega |
| Pheidole williamsi | CAS | 1997-11-20 19:00:00 | Isabela, V. Alcedo |
| Pheidole williamsi | CAS | 2006-04-28 19:00:00 | Isabela, V. Wolf; Pega Pega |
| Pheidole williamsi | CAS | 2006-04-28 19:00:00 | Isabela, V. Wolf; Pega Pega |
| Pheidole williamsi | CAS | 2006-04-28 19:00:00 | Isabela, V. Wolf; Pega Pega |
| Pheidole williamsi | CAS | 1905-10-31 19:00:00 | Indefatigable Island [Santa Cruz Island] |
| Pheidole williamsi | CAS | 1905-10-31 19:00:00 | Indefatigable Island [Santa Cruz Island] |
| Pheidole williamsi | CAS | 1905-01-10 19:00:00 | Indefatigable I. |
| Pheidole williamsi | MCZ | 1905-10-31 19:00:00 | Indefatigable Island (=Santa Cruz Island) |