tick

mite of the families Ixodidce and Argasidiz, both of which contain many parasitic species which transmit pathogenic protozoa to man and the lower animals so far as known only members of the family ArgasidcE are injurious to man, African relapsing fever t., Ornitkodorus moubata. spotted-fever t., Derma cent of modest us, D. venus Mar gar opus annul at us, the t. instrumental in the spread of Texas cattle fever.