Brachypelma smithi is a species of spider in the family Theraphosidae (tarantulas ) native to Adult females vary more in carapace color and pattern.
Brachypelma hamorii is a species of tarantula found in Mexico. It has been confused with B. smithi; both have been called Mexican redknee The species is a large spider, adult females having a total body length over 50 mm (2 in) and males.
Mexican red-knee tarantulas, Brachypelma smithi, are primarily found along the Adult males have special copulatory organs located on their pedipalps. Females, though infrequently, continue to molt after reaching sexual maturity at 6 to 7.