Here are my suggestions (including some additions by other Finns) for the figures to be used when playing with for the [FWC] lists of Marine Corps and Bug Colony.

Marine Corps

Recce Unit (Marine Scouts)  –  Scouts
Recce Unit (M4A2 All-Terrain Bike)  –  Bike
Recce Unit (M6A2 Grav Bike)  –  Land Speeder
Infantry Unit (Regular Marines)  –  Tactical
Infantry Unit (Assault Marines)  –  Assault
Infantry Unit (Power Marines)  –  Terminators
Infantry Unit (M4A2 All-Terrain Bike)  –  Bike
Infantry Unit (M6 Grav Bike)  –  Land Speeder
Infantry Upgrade (Rocket Launcher)  –  Devastator Upgrade
Support Unit (Support Marines)  –  Devastators
Support Unit (M7A1 Assault Walker)  –  Dreadnought w/ CCW & Assault Cannon
Support Unit (M7A2 Support Walker)  –  Dreadnought w/ Missile & Lascannon
Support Unit (M4A4 Support Bike)  –  Assault Bike
Support Unit (M6A2 Grav Bike)  –  Land Speeder Tornado
Support Unit (M6A4 Grav Bike)  –  Land Speeder Typhoon
IFV Unit (M50 'Bad Dawg')  –  Rhino
IFV Unit (M51A)  –  Razorback w/ Twin Heavy Bolter
IFV Unit (M52B)  –  Razorback w/ Twin Lascannon
IFV Unit (M1 'Big Mama' Assault Vehicle)  –  Land Raider
Tank Unit (M18 Support Tank)  –  Predator Destructor
Tank Unit (M19 Tank Destroyer)  –  Predator Annihilator
SPG Unit (M1A1 'Bad Ass' Assault Tank)  –  Vindicator
SPG Unit (M1 Missile System)  –  Whirlwind
Walker Unit (M1A5 'Coyote')  –  Warhound Titan
Walker Unit (M2A1 'Avenger')  –  Reaver Titan
Walker Unit (M3 'Death Dealer')  –  Warlord Titan
Walker Unit (M8 'Hellfire')  –  Imperator
Air Defence Unit (M13 ' Night Owl')  –  Hunter
Artillery Unit (M1 Missile System)  –  Whirlwind
Aircraft Unit (F3 Fighter Bomber)  –  Thunderbolt Fighter
Aircraft Unit (B5 Light Bomber)  –  Marauder Bomber
Gunship Unit (A51B Marine Gunship)  –  Thunderhawk Gunship
Dropship Unit (C51D Marine Transport)  –  Thunderhawk Transporter
Dropship Unit (C54 Air Mobile Lander)  –  Landing Craft
Dropship Unit (C55A Air Mobile Pod)  –  Drop Pod
Dropship Unit (C55B Air Mobile Pod)  –  Drop Pods


Bug Colony

Key: ...TG... = Termagant, etc.

Infantry Unit (Warrior TG772)  –  Termagant
Infantry Unit (Warrior GG396)  –  Gargoyle
Infantry Unit (Warrior HG948)  –  Hormagaunt
Infantry Unit (Warrior RN601)  –  Ravener
Infantry Unit (Warrior GS772)  –  Genestealer
Infantry Unit (Warrior LT825)  –  Lictor
Infantry Unit (Warrior WR910)  –  Tyranid Warrior
Infantry Unit (Warrior HT292)  –  Hive Tyrant
Armoured Unit (Warrior TG663)  –  Trygon
Armoured Unit (Warrior HX774)  –  Haruspex
Armoured Unit (Warrior MF418)  –  Malefactor
SPG Unit (Worker BV221)  –  Biovore
SPG Unit (Worker DT271)  –  Dactylis
SPG Unit (Worker EC192)  –  Exocrine
SPG Unit (Worker ER739)  –  Expectorator (suggested by Hena)
Walker Unit (Warrior VF552)  –  Carnifex w/ Venom Cannon (suggested by Nicodemus)
Walker Unit (Warrior CF829)  –  Carnifex w/ Scything talons i.e. Screamer-killer
Walker Unit (Warrior HS019)  –  Scythed hierodule
Walker Unit (Warrior HC019)  –  Barbed hierodule
Walker Unit (Warrior HP475)  –  Hierophant
Walker Unit (Warrior DH228)  –  Hydraphant (or Dominatrix; by FWC site)
Air defence Unit (Worker ZT319)  –  Zoantrope
Artillery Unit (Worker BV221)  –  Biovore
Artillery Unit (Worker DT271)  –  Dactylis
Artillery Unit (Worker EC192)  –  Exocrine
Artillery Unit (Worker ER739)  –  Expectorator (suggested by Hena)
Gunship Unit (Worker HD825)  –  Harridan
Gunship Unit (Worker VT418)  –  Vituperator
Transport Unit (Worker SN772)  –  Synapse Node

Not included are Broodlord and meiotic spores.

EDITS:
1. 2008-10-08: Added one explanation (for ER)
2. 2008-10-09: Added a second (for VF) + full weapon names for Marines
3. 2008-10-11: Added dominatrix to the list

Sounds good to me !    But FWC has not made it's way to the US yet ... so I don't have the book ...  

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Legion 4 "Cry Havoc, and let slip the Dogs of War !" ... "People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf."

ER is their largest gun. Its a monstrous thing.

VF on the other hand is their smallest walker.

PS. I found Epic Tyranid list v5.4 (2005) where its said:
Expectorator: (A VERY large Biovore! Use a 28mm 40k Biovore as a proxy for this model for the time being.)

VF, Venomfex? Carnie with oh once so popular venomcannon?

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Eradication of Earth's
Population loves Polaris

Well done Nicodemus! That fits beautifully.

I have the lists from the beta test and am just waiting for permission to post the comparison lists.

_________________
Guns don't break formations. Blast Markers break formations.

I have cobbled together a greasemonkey script for the eldritch list as a start.
This replaces the original FWC names for eldar units with the more familiar version whilst not causing the site host to breach IP/copyright issues.
It would only be a couple of hours work to do it for all the armies listed in the comparison list.

Obviously you need to be viewing the battlegroups using firefox first!

Let me know if there is any interest.