I'm not able to recognize the spider in the second one; the spider in the first and third pic (the same, i suppose) may be Araneus angulatus or circe. ^_^
The second spyder quite shure is an Argyrodes sp.(Theridiidae) . It is a small spyder that uses to live - sometimes in groups - in the web of bigger spyders steeling a part of their preys. You may find a lot of documentation on it in our Gallery luigi
Modificato da - elleelle in data 14 marzo 2012 23:23:53