found: Work cat.: 27027023: Knowlton, G.F. The digestive tract of Longistigma caryae (Harris), 1925.
found: Blackman R.L. Aphids on the world's crops, 2000:p. 288 (Longistigma caryae (Harris), Giant bark-feeder)
found: University of Florida IFAS Extension Web site, Aug. 10, 2007(Giant bark aphid, Longistigma caryae (Harris). This bark-feeding aphid was first described by Harris (1841) as Aphis caryae from pignut hickory, Carya glabra Sweet, in Massachusetts.)
notfound: Arnett, R. American insects, 2000;ITIS search, Aug. 10, 2007
