Have key ID, but can't decrypt.

[Jason Price]

I have a feeling I'm being stupid.

When I 'gpg --list-keys', I get:

> gpg --list-keys
gpg: WARNING: using insecure memory!
gpg: please see http://www.gnupg.org/faq.html for more information
/usr/local/home/jprice/.gnupg/pubring.gpg
-----------------------------------------
pub  1024D/F64BA00C 2002-10-07 Jason Price <jprice@cyberbuzz.gatech.edu>
sub  1024g/6B38F22C 2002-10-07

pub  1024D/FAD37ABE 2002-08-24 Edward Graham V <egraham@gttx.org>
sub  4096g/34B2393A 2002-08-24

However, when I try and decrypt a message, I get:

> gpg --decrypt egr.1.pgp
gpg: WARNING: using insecure memory!
gpg: please see http://www.gnupg.org/faq.html for more information
gpg: encrypted with 4096-bit ELG-E key, ID 34B2393A, created 2002-08-24
      "Edward Graham V <egraham@gttx.org>"
gpg: decryption failed: secret key not available
gpg: encrypted with 4096-bit ELG-E key, ID 34B2393A, created 2002-08-24
      "Edward Graham V <egraham@gttx.org>"
gpg: encrypted with 4096-bit ELG-E key, ID 34B2393A, created 2002-08-24
      "Edward Graham V <egraham@gttx.org>"
gpg: decryption failed: secret key not available

That "keyid" is in my key ring.  Why can't I decrypt?

Thanks for any help;
Jason