This no-referrals bot isn't new. [
webmasterworld.com...] [
google.com...]
This ignore-robots.txt behavior is:
64.22.106.82 [
projecthoneypot.org...]
Gigabot/3.0 (http://www.gigablast.com/spider.html)
01:43:34 /robots.txt [200]
01:43:35 /dir/filename.html/
(Aside: That trailing-slash file URI was denied from the get-go.)