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Five new grasses from Colombia
Vol 21, Page 14, Date 1931
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Two new Hymenopterous parasites of Tachy-pterellus consors Dietz
Vol 21, Page 37, Date 1931
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New Bahaman Reptiles
Vol 21, Page 39, Date 1931
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Flagellate spermatozoa in a nematode (Trilobus longus)
Vol 21, Page 41, Date 1931
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A new spiral-orchid from the southern states
Vol 21, Page 49, Date 1931
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Revision of the Names of three Fossils from the Castle Hayne and Trent Marls in North Carolina
Vol 21, Page 51, Date 1931
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The Mastodon of Thomas Jefferson
Vol 21, Page 80, Date 1931
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The genus Mendoncia in Peru
Vol 21, Page 144, Date 1931
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A report on some amphibians and reptiles from New York and New Jersey
Vol 21, Page 198, Date 1931
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On a collection of Cope-poda made in El Salvador by Samuel F. Hildebrand and Fred J. Foster of the U. S. Bureau of Fisheries
Vol 21, Page 207, Date 1931
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Three new Pumas
Vol 21, Page 209, Date 1931
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On certain Hymenopterous parasites of stored-grain insects
Vol 21, Page 213, Date 1931
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Notes on Gypona octolineata (Say)
Vol 21, Page 222, Date 1931
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A revisional study of the genus Pseudopityophthorus Sw. in North America
Vol 21, Page 223, Date 1931
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Two new desert foxes
Vol 21, Page 249, Date 1931
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Bats from the Bahamas
Vol 21, Page 251, Date 1931
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Resistance of rats to superinfections with a nematode, Nippostrongylus muris, and an apparently similar resistance of horses to super-infection with nematodes
Vol 21, Page 259, Date 1931
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A new species of pinnotherid crab from Costa Rica
Vol 21, Page 262, Date 1931
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A revisional study of the genus Gnathotrichus Eichhoff in North America
Vol 21, Page 264, Date 1931
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Additional Costa Rican mosses, II
Vol 21, Page 288, Date 1931
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A Microfilaria from the blood of a wild rabbit
Vol 21, Page 298, Date 1931
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Three new Braconidae parasitic on bark-beetles
Vol 21, Page 301, Date 1931
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Adoretus luridus and its near relatives in the Philippine Islands
Vol 21, Page 305, Date 1931
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New species of Melolonthine Scarabaeidae from the Philippine Islands
Vol 21, Page 309, Date 1931
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Synopsis of Perigcuter (Coleoptera: Curculionidae)
Vol 21, Page 320, Date 1931
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Nine new American Asteraceae
Vol 21, Page 325, Date 1931
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The genus Lozanella
Vol 21, Page 336, Date 1931
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New plants mainly from western South America - III
Vol 21, Page 347, Date 1931
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A new lizard (Anolis pinchoti) from Old Providence Island
Vol 21, Page 354, Date 1931
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New Carboniferous Invertebrates
Vol 21, Page 390, Date 1931
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The copepod genera Broteas Loven, Paradiaptomus Sars, Lovenula Schmeil, Metadiaptomus Methsen, and Adiaptomus Cooper
Vol 21, Page 397, Date 1931
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Metagonimoides oregonensis, a new Trematode from a raccoon
Vol 21, Page 405, Date 1931
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New pocket gophers from Arizona and Utah
Vol 21, Page 416, Date 1931
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Akodon chacoensis a new Cricetine Rodent from Argentina
Vol 21, Page 427, Date 1931
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New Jassinae, with notes on other species
Vol 21, Page 430, Date 1931
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Two new grasses from Mexico
Vol 21, Page 436, Date 1931
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A new kinkajou from Mexico
Vol 21, Page 482, Date 1931
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Notes on yagé, a drug plant of southeastern Colombia
Vol 21, Page 485, Date 1931-12-04
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A crown-rot of hollyhocks caused by Phytophthora megasperma n. sp
Vol 21, Page 513, Date 1931
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The genus Chikusichloa of Japan and China
Vol 21, Page 526, Date 1931
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Six new White-footed Mice (Peromyscus maniculatus group) from islands off the Pacific Coast
Vol 21, Page 530, Date 1931
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Neotylenchus abulbosus n.g., n. sp. (Tylenchidae, Nematoda) the causal agent of a new nematosis of various crop plants
Vol 21, Page 536, Date 1931
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A new volutid marine mollusk Aurinia schmitti
Vol 21, Page 539, Date 1931