This entry and beta 331 both derive from the scholia to Aristophanes, Clouds 1176 (web address 1 below), quoted under 331. As we see there, the word Aristophanes used is ble/pos, a third-declension neuter noun whose plural would be ble/ph. The present entry not only converts this into a plural but generates a non-existent plural, as if from second-declension masculine. But the reading may be erroneous: ps.-Zonaras has ble/pos.