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