The nomenclatural problems with the hackberry gall psyllid species names are rectified. The genus Pachypsylla Riley, 1883, type species, Psylla venusta Osten-Sacken, includes 14 nominal species: Pachypsylla venusta (Osten-Sacken, 1861); P. celtidismamma Riley, 1875; P. celtidisgemma Riley, 1885; P. celtidisasterisca Riley, 1890; P. celtidiscucurbita Riley, 1890; P. celtidisglobula Riley, 1890; P. celtidispubescens Riley, 1890; P. celtidisumbilicus Riley, 1890; P. celtidisvesiculus Riley, 1890; P. celtidisinteneris Mally, 1894; P. dubia Patch, 1912; P. pallida Patch, 1912; P. tropicala Caldwell, 1944; and P. cohabitons Yang & Riemann, 2001.
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Vol. 122 • No. 3