egrep error: egrep: /usr/dict/words: No such file or directory

[David R]

Hi
if I try M-x ispell-complete-word-inferior-frac I get the message which 
is the subject title of this thread
If I do M-x ispell-change-dictionary emacs lists about 20 possible 
completions

What is happening?
Is this a bug in ispell which I am using via aspell (setq-default 
ispell-program-name "aspell")
How can I tell emacs to make ispell-complete-word-inferior-frac look in 
the same dictionaries which ispell-change-dictionary looks at?
How can I discover where ispell-change-dictionary looks?

thanks
david R