McGregor, E.A., 1917.
Description of seven new species of red spiders. Proceedings of the United States National Museum, 51: 581-590.

Abstract
Six species of Tetranychus and one of Tetranychina are herein described for the first time. Two of these from South America and five from North America are of some economic importance. One discolors the leaves of American holly, one injures at times the appearance of the beautiful western white oak, and one saps the vitality of the large huckleberry of the Cascade region.

    • Summary

  • Nomenclature
  • Identification
  • Host plants
  • Distribution
  • Other biological features

    • Nomenclatural data

  • Eotetranychus carpini (Oudemans, 1905); Eotetranychus willamettei (McGregor, 1917);
  • Eutetranychus banksi (McGregor, 1914);
  • Oligonychus (Oligonychus) ilicis (McGregor, 1917); Oligonychus (Oligonychus) peruvianus (McGregor, 1917);
  • Petrobia (Tetranychina) harti (Ewing, 1909).

    • Identification tools

    Host plant data (8 results)

  • Eotetranychus carpini (Oudemans, 1905) [Ericaceae: Vaccinium sp.; Rosaceae: Prunus sp.]; Eotetranychus willamettei (McGregor, 1917) [Fagaceae: Quercus garryana];
  • Eutetranychus banksi (McGregor, 1914) [Caricaceae: Carica papaya];
  • Oligonychus (Oligonychus) ilicis (McGregor, 1917) [Aquifoliaceae: Ilex opaca]; Oligonychus (Oligonychus) peruvianus (McGregor, 1917) [Salicaceae: Salix sp.];
  • Petrobia (Tetranychina) harti (Ewing, 1909) [Oxalidaceae: Oxalis corniculata; Oxalis stricta].

    • Distribution data (6 results)

  • Eotetranychus carpini (Oudemans, 1905) [Nearctic: United States]; Eotetranychus willamettei (McGregor, 1917) [Nearctic: United States];
  • Eutetranychus banksi (McGregor, 1914) [Neotropical: Peru];
  • Oligonychus (Oligonychus) ilicis (McGregor, 1917) [Nearctic: United States]; Oligonychus (Oligonychus) peruvianus (McGregor, 1917) [Neotropical: Peru];
  • Petrobia (Tetranychina) harti (Ewing, 1909) [Nearctic: United States].

    • Other biological features