Large Scorpion, Huge Scorpion.

Often found in dungeons && wildernesses, these creatures are merely
smaller versions of the giant scorpion. Each attacks with pincers and tail
stinger. If struck by the stinger, the victim must save vs. poison or be
instantly killed. However, the poison of the large scorpion is weaker than
normal (+2 on saving throw).
 

Q: My character was recently overwhelmed
by a horde of small scorpions
that swarmed out of a barrel. I
later discovered that these tiny
monsters have 2 + 2 HD, three
attacks each, and move as fast as an
armored man. Isn?t that a bit much
for normal arachnids?

A: For normal arachnids, yes. But a 2 + 2
HD scorpion is not a normal creature. This
creature is listed in the Monster Manual II
as small, which means it?s smaller than a
normal human ? but easily 3-4? long. (See
the introductory sections of the monster
tomes for explanations of all the terms
used in monster descriptions.) A horde of
them could not fit in a barrel; your DM
made a mistake. A swarm of biting or
stinging insects or arachnids inflicts 1-2 hp
per round at most. If they have poison,
one save per round will suffice.
(138.13)
 

Large Scorpion

FREQUENCY: Common

FREQUENCY: Common ([Dungeon Level III])

FREQUENCY: Common ([Cold Wilderness Swamp], [Cold Wilderness Plains], [Cold Wilderness Desert])
FREQUENCY: Uncommon ([Cold Wilderness Mountains], [Cold Wilderness Hills], [Cold Wilderness Forest])

FREQUENCY: Common ([Temperate Wilderness Swamp], [Temperate Wilderness Plains], [Temperate Wilderness Desert])
FREQUENCY: Uncommon ([Temperate Wilderness Mountains], [Temperate Wilderness Hills], [Temperate Wilderness Forest])

FREQUENCY: Common ([Tropical Wilderness Swamp], [Tropical Wilderness Plains], [Tropical Wilderness Desert])
FREQUENCY: Uncommon ([Tropical Wilderness Mountains], [Tropical Wilderness Hills], [Tropical Wilderness Forest], [Tropical Wilderness Desert])
FREQUENCY: Rare ([Tropical Wilderness Hills])

NO. APPEARING: 1-6
ARMOR CLASS: 5
MOVE: 9"
HIT DICE: 2+2
% IN LAIR: 25%
TREASURE TYPE: [D]
NO. OF ATTACKS: 3
DAMAGE/ATTACK: 1-4/1-4/1 ~ 16
SPECIAL ATTACKS: Poison sting
SPECIAL DEFENSES: Nil
MAGIC RESISTANCE: Standard
INTELLIGENCE: Non-
ALIGNMENT: Neutral
SIZE: S
LEVEL/X.P. VALUE: III | 90 + 3

SAVES: 14.15.16.17.17

The poison of the large scorpion is weaker than normal (+2 on saving throw).
 
 

Huge Scorpion

FREQUENCY: Uncommon

FREQUENCY: Common ([Dungeon Level IV])

FREQUENCY: Uncommon ([Cold Wilderness Mountains], [Cold Wilderness Swamp], [Cold Wilderness Plains], [Cold Wilderness Desert])
FREQUENCY: Rare ([Cold Wilderness Hills])

FREQUENCY: Uncommon ([Temperate Wilderness Mountains], [Temperate Wilderness Hills], [Temperate Wilderness Forest], [Temperate Wilderness Swamp]) <check>
FREQUENCY: Uncommon ([Temperate Wilderness Plains], [Temperate Wilderness Desert])

FREQUENCY: Uncommon ([Tropical Wilderness Mountains], [Tropical Wilderness Forest], [Tropical Wilderness Swamp], [Tropical Wilderness Plains])
FREQUENCY: Rare ([Tropical Wilderness Hills])

NO. APPEARING: 1-4
ARMOR CLASS: 4
MOVE: 12"
HIT DICE: 4+4
% IN LAIR: 25%
TREASURE TYPE: [D]
NO. OF ATTACKS: 3
DAMAGE/ATTACK: 1-8/1-8/1-3
SPECIAL ATTACKS: Poison sting
SPECIAL DEFENSES: Nil
INTELLIGENCE: Non-
ALIGNMENT: Neutral
SIZE: M
LEVEL/X.P. VALUE: IV | 165 + 5

SAVES: (11)13.14.15.16.16