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  ftp://ftp.ncbi.nih.gov/pub/HomoloGene/current/

 homologene_group_id | tax_id | geneid  |     symbol      | protein_gi
+ | protein_accession 
---------------------+--------+---------+-----------------+-----------
+-+-------------------
...
                   3 |   7165 | 1276346 | AgaP_AGAP005662 |   58387602
+ | XP_315683.2
                   3 |   6239 |  181757 | acdh-10         |   17569725
+ | NP_510788.1
(

...
";

echo "select count(*) from my_homologene_data" | psql;

select * from my_homologene_data where homologene_group_id = 31015

http://www.ncbi.nlm.nih.gov/homologene/?term=31015