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Show 272 MR. W. SCHAUS ON N E W [Apr. 5, anatomically unisexual, yet functionally I believe it to be so. Having observed numerous individuals and pairs, I am able to say that the female is constantly larger than the male. I may add a word as to the best method of killing these mollusks. If placed in a sort of vapour-bath or in a vessel of water, and heated very slowly and gradually, they die painlessly and in a condition with the tissues relaxed much more suitable for the purposes of the anatomist than if killed by immersion in hot water or in any acrid fluid. W h e n it is desired to preserve the shell in a perfectly clean condition, the whole should, after the animals are dead, be boiled so that the soft parts may readily come away from the shell. 4. Descriptions of new Species of Lepidoptera Heterocera from Brazil, Mexico, and Peru.-Part I. B y W . S C H A U S, F.Z.S. [Eeceived March 16, 1892.] The following descriptions are all taken from specimens in my own collection, and those of the Brazilian and Mexican species were chiefly collected by myself. Fam. AGARISTID^E. O T H R I A M E R I D I O N A L I S , sp. nov. Velvety black ; the primaries with a narrow transverse band of a creamy white, extending from the middle of the subcostal vein to close to the inner angle. Underneath the transverse band is slightly wider than on the upper surface. Expanse 34 m m. Hab. Petropolis, Brazil. Fam. ZYG.ENID,E. H A R R I S I N A J A N E I R A , sp. nov. Dull greenish black; the second and third abdominal segments bright red. Expanse 26 m m. Hab. Petropolis, Brazil. HARRISINA DANTASI, sp. nov. Dull black ; a bright orange spot on either side of the collar. Expanse 21 m m. Hab. Novo Friburgo, Brazil. HARRISINA EMINENS, sp. nov. Bluish black ; the base of the wings yellow and on the primaries a yellow mark crossing the wing from the subcostal vein at about two thirds from the base and extending to the outer margin just above the inner angle ; this mark is somewhat in the shape of a T, |