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Genus Aphalara

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Biological Notes and New Records of North American Chermidae (Homoptera)
By Klyver, F.D.
Entomological News 43, 1932

Biosystematics of hackberry psyllids (Pachypsylla) and the evolution of gall and lerp formation in psyllids
By Yang, M.-M. & C. Mitter
The Ecology and Evolution of Gall-forming Insects. United States Dept. of Agriculture, 1993

The Nearctic Psylloidea (Insecta: Homoptera): an annotated check list
By Hodkinson, I.D.
Journal of Natural History, 22 (1179-1243), 1988
[cite:1177162]

The psyllids (Homoptera-Psyllidae) of Alaska
By Hodkinson I.D.
Systematic Entomology 3: 333-360, 1978

Psyllidae found at Ames, Iowa.
By Mally C.W.
Proceedings of the Iowa Academy of Sciences 2:152-171., 1894

A revised classification of the jumping plant-lice (Hemiptera: Psylloidea)
By Burckhardt D. & Ouvrard D.
Zootaxa 3509: 1-34., 2012

Two new species of Calophya and notes on others (Psyllidae: Homoptera)
By Tuthill, L.D.
Entomological News 53: 215-218., 1942

Notes on North American Psyllidae.
By Schwarz, E. A.
Proceedings of the Entomological Society of Washington 6: 234-245, 1904

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