I was studied the histology of Amblyomma tigrinum (Ixodidae) an ixodid fick. Three A. tigrinum engorged females were dissected, collected ovary and tracheae, and fixed in Bouin's aqueous fixative during 24 hours; the organs were cut at a thickness of 6-7 um and stained by hematoxylin-eosin. Ovary of A. tigrinum (Fig. 1) showed two cellular layers, similar to the ovary of D. andersoni and B. microplus, being one outer (oocyts) and the inner layer (epithelial cells). Trachea (Fig. 2) showed a cellular layer and a chitions spiral, similar to D. andersoni