The detailed host list presents the whole host list, with the visits done by each host. The last XX visits are displayed with the full visit path. The other visits are displayed only with the pages and the corresponding visit date.
For human hosts, it is possible that proxies and robots are not recognized. Some hints to identify such hosts:
Visit duration for robots: depending on how the robot is designed, visits can be very long (if the robot is friendly) or very short (is the robot is not friendly or if the visit consists in only one hit). New robots tends to be designed in order to increase the visit duration in order not to satturate the web server.