i have a 4 month kitten hwo has his hair thinning between his ears and
his eyes { it is as if you put a peice of tape between these 2 points
and the hair is just thinner there] the rest of his body has thick
black hair he is in excellent health frendly-hungry-growing is this
common in cats or is it a form of alopica ???

Has the kitten been examined by a veterinarian? Hair loss can have a
multiplicity of causes.

Pinkfreud has my mantra!

Your kitten should be examined by your veterinarian; at four months,
he is ready for his final set of vaccines-- you HAVE been getting him
the proper tests and vaccines, right?-- and may even be big enough to
be neutered. While there, your vet can check to see if he has any
problem with the skin or hair by the ears.

Cats have scent glands concentrated in this area-- that's why they rub
their head against you ("I love you!") not to mention the coffee table
("You, too!")-- and thinner hair in the area is not uncommon. It can
be particularly noticeable in black cats. The developing scent glands
are an indication of adolescence and a kitten's emerging sexual
maturity. Spraying to mark territory isn't too far behind.

And nothing can turn you off a cutesy-wutesy widdle kitty like tomcat
pee. Call your vet and ask if he's big enough to neuter now, and have
him checked out.

My two cats, as most do, have thin hair right above their eyes. It
doesnt seem too far a stretch to consider your situation a normal
variant.

You should ask the vet when you are due for an exam.  Hair thinning
can be caused by many things, parasites, flea's, stress and
hyperthyroidism.  If hyperthyroidism is the culprit, (they can tell
with blood work) you want your cat to be on medication as soon as
possible as the longer you don't treat, the worse the problem becomes.
 Tapazole is usually the drug of choice for this problem.  Definitely
talk to the vet.