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A new genus of tyrant-flycatchers
Vol 50, Page 1, Date 1937
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The southern races of the great ant-shrike, Taraba major
Vol 50, Page 7, Date 1937
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The status of Hyla evittata Miller
Vol 50, Page 9, Date 1937
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A new species oi Spathacanthus from Guatemala
Vol 50, Page 15, Date 1937
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Notes on Astragalus (Toumef. L)
Vol 50, Page 17, Date 1937
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A race of the Derby Flycatcher from northwestern Mexico
Vol 50, Page 25, Date 1937
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The Ferruginous Pigmy Owl of northwestern Mexico and Arizona
Vol 50, Page 27, Date 1937
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A new mountain sheep from Lower California
Vol 50, Page 29, Date 1937
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Studies in American spiders: the genus Aigola
Vol 50, Page 35, Date 1937
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New species of hylid frogs from Mexico with comments on the rare Hyla bistincta Cope
Vol 50, Page 43, Date 1937
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Five new North American zonitids
Vol 50, Page 55, Date 1937
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Three new birds from the Malaysian subregion
Vol 50, Page 61, Date 1937
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New races of the genus Otus from northwestern Mexico
Vol 50, Page 63, Date 1937
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Revisional note on the didine birds of Reunion
Vol 50, Page 69, Date 1937
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A new race oi Dactylortyx from Honduras
Vol 50, Page 73, Date 1937
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A new kangaroo rat from southwestern Arizona
Vol 50, Page 75, Date 1937
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The distribution of flying suirrels in western British Columbia with the description of a new race
Vol 50, Page 77, Date 1937
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A new subspecies of the lizard genus Sceloporus from Texas
Vol 50, Page 83, Date 1937
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Preliminary list of the butterflies of Virginia
Vol 50, Page 87, Date 1937
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New plants from Oregon
Vol 50, Page 93, Date 1937
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Four new birds from northwestern Mexico
Vol 50, Page 95, Date 1937
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Two new owls from Sinaloa, Mexico
Vol 50, Page 103, Date 1937
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The blue-gray gnatcatcher of southern Sonora
Vol 50, Page 109, Date 1937
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A new ant-like thrips from Florida
Vol 50, Page 111, Date 1937
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Notes on the nomenclature of the Trochidae
Vol 50, Page 115, Date 1937
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Descriptions of two new passerine birds from the western United States
Vol 50, Page 117, Date 1937
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Some new species and varieties of Oregon plants
Vol 50, Page 121, Date 1937
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A new snake from southeastern China
Vol 50, Page 125, Date 1937
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New N. A. leafhoppers belonging to Parabolocratus and related genera
Vol 50, Page 129, Date 1937
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Two new pocket gophers of the Thomomys bottae group
Vol 50, Page 133, Date 1937
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Reptiles and amphibians
Vol 50, Page 137, Date 1937
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A new neotenic salamander from Texas
Vol 50, Page 141, Date 1937
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On the flightless heron of Rodriguez
Vol 50, Page 145, Date 1937
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New race of Chubbia jamesoni from Colombia
Vol 50, Page 151, Date 1937
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Four new rodents from Monterey County, California
Vol 50, Page 153, Date 1937
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The yellow-green vireo of northwestern Mexico
Vol 50, Page 159, Date 1937
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The tiger-bittern of northwestern Mexico
Vol 50, Page 161, Date 1937
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Concerning the genus Leptobyrsa Stal (Hemiptera)
Vol 50, Page 163, Date 1937
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New species of mites of the subfamily Trombiculinae, with a key to the New World larvae of the akamushi group of the genus Trombicula
Vol 50, Page 167, Date 1937
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Critical remarks on Crypturellus vanegatus and its allies
Vol 50, Page 175, Date 1937
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A new species of Dryopteris, subgenus Eudryopteris, from Guatemala
Vol 50, Page 179, Date 1937
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Description of a race of Perognathus parvus from Arizona
Vol 50, Page 181, Date 1937
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Two new swifts of the genus Chaetura
Vol 50, Page 183, Date 1937
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The pigeons of the Columba plumbea group
Vol 50, Page 185, Date 1937
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A new race of Tinamus major from Brazil
Vol 50, Page 191, Date 1937
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A new woodpecker of the genus Piculus from Sonora
Vol 50, Page 195, Date 1937
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A race of Verreaux's dove from Sonora
Vol 50, Page 199, Date 1937
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New races of Myadestes, Spizella and Turdus from northwestern Mexico
Vol 50, Page 201, Date 1937
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A new Indian paint-brush from Mount Rainier
Vol 50, Page 207, Date 1937
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Extinct chough from Rodriguez
Vol 50, Page 211, Date 1937
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A new race of Peromyscus maniculatus from British Columbia
Vol 50, Page 215, Date 1937
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A new race of Yuhina flavicollis, from the mountains of north Siam
Vol 50, Page 217, Date 1937
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Description of a new chickadee from the eastern United States
Vol 50, Page 219, Date 1937
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Four new mammals from Utah
Vol 50, Page 221, Date 1937
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A new race of the spotted tinamou, Nothura maculosa, from the Paraguayan Chaco
Vol 50, Page 227, Date 1937