Subfamily Pachypsyllinae
First incidence of inquilinism in gall-forming psyllids, with a description of the new inquiline species By Yang, M.-M., C. Mitter & D.R. Miller
Zoologica Scripta, 30, 97–113, 2001
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The Authority and Types for the Hackberry Gall Psyllid Genus Pachypsylla (Riley) (Hemiptera: Psyllidae) By Thomas, D.B.
Entomological News, 122(3):279-287, 2011
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Insects Injurious to Forest and Shade Trees By Alpheus, S.P.
Fifth Report of the United States Entomological Commission, 1891
Hackberry Psyllidae by C.V. Riley, P.614 - 622 describes a number of unique leaf galls of species in the Pachypsylla celtidismamma complex.
Free ebook from Google Books
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The psyllids (Hemiptera: Psylloidea) of Florida: newly established and rarely collected taxa and checklist By Halbert SE, Burckhardt D
Insecta Mundi 0788: 1–88, 2020
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New species of Psylla from the western United States and biological notes By Jensen, D.D.
Canadian Entomologist 88: 101-109, 1956
Original descriptions for four species: Cacopsylla notapennis, C. pararibesiae, C. acuminata, & C. nigranervosa, plus a redescription of C. ribesiae
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Characters of two North American Chermidae By Van Duzee, E.P.
Pan-Pacific Entomologist 1: 22-23, 1924
Original description of two Californian endemic psyllids, Bactericera lavaterae and Craspedolepta martini. ( pdf)
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The Jumping Place Lice of Ohio (Homoptera: Chermidae) By Caldwell, J.S.
Ohio Biological Survey, 1938
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Life cycle variation and adaptation in jumping plant lice (Insecta: Hemiptera: Psylloidea): a global synthesis By Hodkinson, I.D.
Journal of Natural History Vol. 43, Nos. 1–2, January 2009, 65–179, 2009
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