secret key cannot be imported: "no user ID"

[Adam Monsen]

I was trying to migrate my gpg setup on box_a to box_b. I'm using gpg 1.0.6 
on both boxes. When trying to import the secret key on box_b, it complains 
of "no user ID", even if I import my public key first. Am I doing something 
wrong? Things that don't seem to help:
-removing passphrase from secret key
-exporting from box_a with --no-comment
-specifying secret keyring with --secret-keyring=.gnupg/secring.gpg
-using the hex id rather than userid to specify which key to export

Here's a pseudo-transcript of my activities:
[jimbo@box_a ~]$ gpg -a --export-secret-keys jimbo > test.asc[jimbo@box_a 
~]$ scp test.asc jimbo@box_b:
[jimbo@box_a ~]$ ssh box_b
[jimbo@box_b ~]$ gpg --allow-secret-key-import --import test.asc

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