Abstract
A nuclear-polyhedrosis virus of Wiseana cervinata is described from larvae collected in New Zealand. The virus attacked only tissues of mesodermal orgin. The virions lay singly and randomly in the polyhedral matrix and were often curved or sinuous. They were exceptionally long, measuring about 510 × 25 mμ in size. Dissolution of polyhedra in weak alkali caused contraction of the outer membrane of the virion and bending of the internal virus rod. The outer membrane ruptured and the virus rods straightened out after further exposure to alkali. In some fat-body nuclei a massive production of virions occurred of which very few were enclosed in the polyhedral bodies.
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