Formica diffidens Walker, 1859: 372 (w.) SRI LANKA. Indomalaya.

Primary type information: Primary type material: holotype worker. Primary type locality: Sri Lanka (“Ceylon”): (no further data) (F. Walker). Primary type depository: BMNH. Primary type specimen: CASENT0901536 Type notes: Donisthorpe, 1932b: 575, identifies the holotype as a worker, not a queen.