brown basilisk

Question
QUESTION: i have two brown basilisk. i have them in different enclosures. i know the one is a male but i don't know what the other one is. can you tell me how to tell male from female. i have researched the net and almost every where i have looked has been different.

ANSWER: If the animals are adults, it should be no problem.

Males have a large casque on their head, females just a small one.

Juveniles cannot be sexed other than by probing (using sexing probes), which should only be done by someone with plenty of experience.  It's best just to wait.

Male: http://www.jjaudubongallery.com/Costa%20Rica/Animals/brown%20basilisk.jpg
Female:  http://www.herptrips.com/CR703/CR703Web/7418Basiliscus_basiliscus.jpg

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QUESTION: how do i tell if its a juvenile. it is about a foot and a half long. the males body, head, and claque is a lot larger than the other one.its nose is longer to.

Answer
They are 2 to 3 feet as adults, so sounds like they're not quite fully grown.  If both of them are the same size, and the male clearly has a casque developing, while the other one does not, there's a good chance that the one without the casque is female.  If the one without the casque is smaller, you may have to wait to be sure.

Here are a few of the better care sheets for you:

http://www.reptilechannel.com/lizards/lizard-care/basilisk-care.aspx

http://www.repticzone.com/caresheets/440.html

Care sheets for the more common green water dragon can also be used for brown basilisks.