Vermin Companions

[MoSaT]

I wanted to use the Vermin Companion feat from the Campaign Setting which (until the revised book comes out) is written for 3.5 rules. I've created several Vermin Companions in the PFRPG style based on their entries in the Bestiary. I'd like to know if I've got them at the right power levels, what do you think?

Centipede, Giant
Starting Statistics: Size Small; Speed 40 ft., climb 40 ft.; AC +2 natural armor; Attack bite (1d4); Ability Scores Str 9, Dex 17 Con 12, Int -, Wis 10, Cha 2; Special Qualities darkvision 60 ft.
4th-Level Advancement: Size Medium; Attack bite (1d6); Ability Scores Str +4, Dex –2, Con +2; Special Abilities poison.

Mantis, Giant
Starting Statistics: Size Medium; Speed 30 ft., climb 30 ft. fly 40 ft. (poor); AC +3 natural armor;   2 claws (1d4);   Str 8, Dex 15, Con 16, Int -, Wis 14, Cha 11; Special Qualities darkvision 60 ft., sudden strike
7th-Level Advancement: Size Large; AC +2 natural armor; Attack bite (1d6); Ability Scores Str +8, Dex –2, Con +4. Special Abilities grab, lunge, mandibles,

Scorpion, Giant
Starting Statistics: Size Medium; Speed 50 ft.; AC +3 natural armor; Attack 2 claws (1d4), sting (1d4); Ability Scores Str 11, Dex 12, Con 16, Int —, Wis 10, Cha 2; Special Qualities darkvision 60 ft. tremorsense 60 ft.
7th-Level Advancement: Size Large; AC +4 natural armor; Attack 2 claws (1d6 plus grab), sting (1d6 plus poison); Ability Scores Str +8, Dex –2, Con +4. Special Abilities constrict, grab, poison.

Spider, Giant
Starting Statistics: Size Small; Speed 30 ft., climb 30 ft.; Attack bite (1d4); Ability Scores Str 9, Dex 19, Con 12, Int —, Wis 10, Cha 2; Special Qualities darkvision 60 ft.
4th-Level Advancement: Size Medium; AC +1 natural armor; Attack bite (1d6 plus poison); Ability Scores Str +4, Dex –2, Con +2; Special Abilities poison, web.

Wasp, Giant
Starting Statistics: Size Medium; Speed 20 ft., fly 60 ft. (good) AC +2 natural armor; Attack sting (1d6); Ability Scores Str 10, Dex 14, Con 18, Int -, Wis 13, Cha 11; Special Qualities darkvision 60 ft.
7th-Level Advancement: Size Large; AC +2 natural armor; Attack sting (1d8); Ability Scores Str +8, Dex –2, Con +4. Special Abilities poison.

[Sniggevert]

Not sure about the power level of the companions, but:

Spoiler:

There is a druid with the vermin feats in the new Realm of the Fell Night Queen module, by Neil Spicer, that is done in PFRPG rules. I can't remember how spelled out they were, but I remember the druid was pretty cool in there with his wasp and wasp swarm.