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Contributions toward a monograph of the lepidopterous family Noctuidae of boreal North America. A revision of the species of Acronycta (Ochsenheimer)and of certain allied genera
Volume 21, Page 1
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Descriptions of the species of Cycadeoidea, or fossil cycadean trunks, thus far determined from the Lower Cretaceous rim of the Black Hills
Volume 21, Page 195
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On some new parasitic insects of the subfamily Encyrtinae
Volume 21, Page 231
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On the coleopterous insects of Galapagos Islands
Volume 21, Page 249
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Description of a species of Actaeon from the Quaternary bluffs at Spanish Bight, San Diego, California
Volume 21, Page 297
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Report on a collection of Japanese Diptera, presented to the U.S. national museum by the Imperial University of Tokyo
Volume 21, Page 301
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Notes on the mammals of the Catskill Mountains, New York, with general remarks on the fauna and flora of the region
Volume 21, Page 341
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Topaz crystals in the mineral collection of the U. S. National Museum
Volume 21, Page 361
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Notes on Cytherea (Tivela) crassatelloides Conrad, with descriptions of many varieties
Volume 21, Page 371
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On the occurrence of Amphiuma, the so-called Congo snake, in Virginia
Volume 21, Page 379
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Description of a new species of spiny-tailed iguana from Guatemala
Volume 21, Page 381
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American oniscoid Diplopoda of the order Merocheta
Volume 21, Page 451
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A contribution to the knowledge of the variations of the tree frog Hyla regilla
Volume 21, Page 477
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Japanese Hymenoptera of the family Tenthredinidae
Volume 21, Page 493
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Notes on a collection of fishes from Mexico, with description of a new species of Platypoecilus
Volume 21, Page 539
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The leeches of the U. S. National Museum
Volume 21, Page 543
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On the occurrence of Caulolepis longidens Gill, on the coast of California
Volume 21, Page 565
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The Brachyura collected by the U. S. Fish Commission steamer Albatross on the voyage from Norfolk, Virginia, to San Francisco, California, 1887-1888
Volume 21, Page 567
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On the nomenclature of the whalebone whales of the tenth edition of Linnaeus's Systema Naturae
Volume 21, Page 617
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A new snake from the Eocene of Alabama
Volume 21, Page 637
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The feather-tracts of North American grouse and quail
Volume 21, Page 641
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Note on Oxycottus acutlceps (Gilbert) from Sitka and Kadiak, Alaska
Volume 21, Page 655
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African Diplopoda of the genus Pachybolus
Volume 21, Page 657
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The diplopod family Striariidae
Volume 21, Page 667
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African Diplopoda of the family Gomphodesmidae
Volume 21, Page 677
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Hydroida from Alaska and Puget Sound
Volume 21, Page 741
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The fossil bison of North America
Volume 21, Page 755
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The land reptiles of the Hawaiian islands
Volume 21, Page 783
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Key to the isopods of the Pacific coast of North America, with descriptions of twenty-two new species
Volume 21, Page 815
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Key to the isopods of the Pacific coast of North America, with descriptions of twenty-two new species
Volume 21, Page 815
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Description of a new species of subterraean isopod
Volume 21, Page 871
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Synopsis of the Recent and Tertiary Leptonacea of North America and the West Indies
Volume 21, Page 873
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Description of a new genus and species of discoglossid toad from North America
Volume 21, Page 899