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New records and species of Scolytidae (Coleoptera) from Colombia
Volume 21, Page 1
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Undescribed species of western Nearctic Tipulidae (Diptera). IV
Volume 21, Page 10
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A new species of Cinara from Colorado (Aphididae)
Volume 21, Page 17
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A new species of Cinara from Delaware (Aphididae)
Volume 21, Page 20
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Description of a new species of salamander from Panama
Volume 21, Page 23
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A new beetle mite from Utah (Oribatei: Gymnodamaeidae)
Volume 21, Page 27
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(1) Studies in nearctic desert sand dune Orthoptera. Part 3. A new species of Cibolacris from northern Chihuahua, Mexico
Volume 21, Page 29
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A review and key of North American Cinara (Homoptera: Aphididae) occurring on Picea
Volume 21, Page 35
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(2) Orthoptera studies in Nearctic desert sand dunes. Part 4. A new Trimerotropis from the dunes of eastern New Mexico
Volume 21, Page 51
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Undescribed species of Nearctic Tipulidae (Diptera). I
Volume 21, Page 79
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New species of bark beetles (Coieoptera: Scolytidae), mostly Mexican. Part 6
Volume 21, Page 87