It is proved that l(q)-completeness (1 < q< infinity) is equivalent to l(1)
-completeness (defined by Saxon and Sanchez Ruiz), and becomes a new charac
teristic condition for local completeness. The relationship between dual lo
cal completeness, dual local quasi-completeness and the Banach-Mackey prope
rty is investigated. For a quasi-Mackey space, dual local quasi-completenes
s, c(o)-quasi-barrelledness, Ruess' property (quasi-L) and C-quasi-barrelle
dness are equivalent to each other.