The Black garden ant ("Lasius niger"), also known as the Common black ant, Common house ant or Tramp ant, is a formicine ant. It is a species of the subgenus "Lasius", which is found across Eurasia and in some parts of South America, Southeast Asia and Australasia. The European species is now split into two species; "L. niger", which are found in open areas; and "L. platythorax", which is found in forests .