Crematogaster biroi var. quadriruga Forel, 1911l: 455 (w.) THAILAND. Indomalaya.

Primary type information: Primary type material: lectotype worker (by designation of Hosoishi & Ogata, 2016a: 594). Primary type locality: lectotype Thailand (“Siam”): (no further data) (A.F.G. Kerr) (received from G. Waldo). Primary type depository: MHNG. Secondary type information: Secondary type material: paralectotype workers (number not stated). Secondary type locality: same as for lectotype. Secondary type depository: MHNG (perhaps also BMNH).