This is a common misbelief. In fact, there are other NW genera besides Psalmopoeus and Tapinauchenius without urticating hairs: Acanthopelma, Catumiri, Guyruita, Hemiercus, Holothele, Oligoxystre, Schismatothele, Sickius and the species Ischnocolus rubropilosus.Psalmos and Taps lack the urticating hairs. They are the ONLY NW species with this "nice" feature.