[Molly Mae]

Three in one

Marking time.

Gray to black

Silent mime.

An easy mark

Is slowly slain

And quickly bound

By constant pain.

EDIT: Verbage.

Edited May 26, 2010 by Molly Mae

[EDM]

the three musketeers....???

[Molly Mae]

the three musketeers....???

While you're not sure you're right, I'm sure you're not right.

[Guest]

Black Widow, Tarantula, and some gray poisonous spider

[Molly Mae]

Black Widow, Tarantula, and some gray poisonous spider

I think you're intending for them to all be a part of the answer. I'll give it to you, though.

Black WIdow

Group of three -- American Black Widow comes in three species (Northern, Southern, and Western)

With watch near, -- The hourglass shape

Gray then black -- Infant widows are gray.

Wise man's fear. -- Self-sustaining.

An easy mark -- Widows generally prey passively.

We slowly slay, -- Death is generally not quick.

Steadfastly bound

By toxic pain. -- Refers both to the way the widow holds envenomed prey as well as latrodectism, the most common symptom(s) of a widow bite, which can include joint pain, muscle cramps, paralysis, and death (among a great many other things).

Our name we share -- The name "Black Widow" is shared

With another three, -- with three more species (European Black Widow, Redback, and Katipo)

But a hundred-some more -- Most of the 120+ spiders in genus Steatoda

Attempt mimicry. -- are mistaken for black widows and have earned the name "False Black Widow."

When all of us three -- Take three spiders

Align on the floor -- put them together

Our limbs will total -- leg count =

Four more than a score. -- 24.