[1] Aorist passive participle (masculine nominative singular) from the same verb as lambda 424. Same gloss given in Photius. The earliest known instance of an aorist passive participle is Apollonius Rhodius, Argonautica 4.400 (ληισθεῖσαν ).
[2] This distinction, made by Aelius Dionysius, Ἀττικὰ ὀνόματα s.v. λῃστικόν , attempts to give an active sense to λῃστικόν "plundering" (e.g. "of pirates") vs. λῃστρικόν "plundered". This is clearly not reflected in how λῃστρικός has actually been used (LSJ s.v.) The instance being glossed is Thucydides 1.4; see the scholia there. Aelius Dionysius is cited more closely in Photius; the distinction is also invoked in lambda 474.