def merge_outfiles(filelist, outfile_name):
    """  merge the output from multiple BLAST runs of type 6 output (no headers)
    """
    with open(outfile_name, 'a') as outf:
        for idx, f in enumerate(filelist):
            with open(f, 'r') as inf:
                for line in inf:
                    outf.write(line)
    return outfile_name
