Monomorium rugifrons (Smith, 1858) valid
Myrmica rugifrons Smith, 1858a: 124 (q.) INDIA. Indomalaya.
Primary type information: Type-material: holotype queen. Type-locality: “India (Penang) (Coll. East India House)”. Type-depository: unknown. Type notes: In original description locality is given as “India (Penang)”. Penang is in West Malaysia, far from India. Later Smith, 1871a: 326, gives “India; Penang”, implying two separate localities; but the original description implies that only a single specimen is present.
Obsolete combinations