Is it this bit you were after?
Facehug (P) – Models hit in Close Combat must pass a Con
Test instead of an Armour Test, or lose one Wound. For
each Model removed from play by the Facehug (P) Special
Skill, the Alien player may instantly place one of his own
Alien Faction Models as long as the appropriate Model is
available. Models deployed in such a way are placed on
any, not Engaged, Infected Tile and count as having been
Activated for this Game Turn. After successfully removing
any Model from play by the means of Facehug (P), remove
the Facehugger Model as a casualty.
There is a typo on alien force list on the page 55 regarding the Facehugger - the whole line is the same as the rules for the Stalker - what are the real rules for Facehugger?