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Two new passerine birds from Angola
Vol 31, Page 1
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Critical remarks on the Wood-hewers
Vol 31, Page 5
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A review of the Hydnaceae (Fungi) of Western Pennsylvania
Vol 31, Page 19
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Critical remarks on the Oven-birds
Vol 31, Page 33
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Sphoenognathus curvipes (Coleoptera: Lucanidae), a now species from Bolivia
Vol 31, Page 45
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Taxonomy and distribution of the genus Pierella (Lepidoptera)
Vol 31, Page 49
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The land snails of West Virginia
Vol 31, Page 89
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A review of the pileate Thelephoraceae (Fungi) of Western Pennsylvania
Vol 31, Page 239
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Larval development of Nectophrynoides tornieri (Roux), with comments on direct development in frogs
Vol 31, Page 257
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Description of a new race of the salamander Pseudobranchus striatus (Le Conte)
Vol 31, Page 277
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A review of the Elvellaceae (Fungi) of Western Pennsylvania
Vol 31, Page 281
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A northern race of red-tailed hawk
Vol 31, Page 289
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A new race of paroquet of the species Aratinga astec from the Republic of Honduras
Vol 31, Page 297
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A study of the salamander, Ambystoma cingulatum, with the description of a new subspecies [A. c. bishopi, subsp. nov., p. 300]
Vol 31, Page 299
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An analysis of color and pattern in butterflies of the Asiatic genus Karanasa
Vol 31, Page 321
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A new race of Hudsonian Chickadee
Vol 31, Page 333
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A new Geomyid rodent from tho Miocene of Montana
Vol 31, Page 335
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The mammals of the Mazinaw Lake region of Ontario; their reproduction and population dynamics
Vol 31, Page 339