A quick google search reveals that Larbin is an open source web crawler - http://larbin.sourceforge.net/index-eng.html
I wouldn't rely on robots.txt for anything other than legitimate search engine robots where you want to control the results shown in the search engine results. My site has some info on Larbin too. You may be better to block the bot name using your .htaccess. This post might help: http://www.mod-rewrite.com/forum/showthread.php?p=48 Sarah
FYI FWIW: "Larbin" spidered 81 pages on the www.komar.org website last week with the same IP address of 202.9.158.10 - an example apache log entry is shown below. A reverse lookup of this IP address times out for me, but a traceroute seems to indicate it was from Singapore. alek 202.9.158.10 - - [15/Jul/2004:07:46:27 -0600] "GET / HTTP/1.0" 200 7510 "-" "larbin_2.6.3 snishant@ipolicynet.com"