Crematogaster difformis Smith, 1857a: 76 (w.) SINGAPORE. Indomalaya.

Primary type information: Primary type material: lectotype worker (by designation of Hosoishi & Ogata, 2009a: 22). Primary type locality: lectotype Singapore: “Sing. 25” (A.R. Wallace). Primary type depository: OXUM. Secondary type information: Secondary type material: 5 paralectotype workers. Secondary type localities: 1 paralectotype worker with same data as holotype, 4 paralectotype workers Malaysia: Sarawak, “Sar. 33” (A.R. Wallace). Secondary type depository: OXUM. Type notes: 1) Donisthorpe, 1932c: 450, cites 2 worker syntypes in OXUM, “Sar”. 2) Bolton (unpublished notes) 1978, cites 6 worker syntypes in OXUM.