Abstract
Angiostrongylus michiganensis sp. n. from the bronchioles of Sorex cinereus cinereus in cinereus in Michigan is described. It can be distinguished from a closely related European species, A. soricis, by its greater body length, longer spicules, and the more anterior postion of the vulva. It differs from A. blarini, an American species also found in shrews, in being larger, having longer spicules, and by not occurring in fibrous cysts in the lung. The species of Angiostrongylus and related genera are discussed.