ARRANGEMENT OF A NEST. 43 
Fia. 2. 
Ground pian of a typical nest of Lasius niger, reduced. a, 
narrow doorway; b, hall; ¢, vestibule; @, main chamber; @, inner 
sanctum ; f, f,f, f, narrow entrance passages to sanctum; 9 9 spe- 
cial pillars. 
