118 KANSAS UNIVERSITY QUARTERLY. 



Salix nigra, Cooley, Spec. Bull. Mags. Agr. Col., p. 21, Aug. 1899. 



Cornus pubescens, ibid. 



Cornus asperifoUa, ibid. 



Balm of Gilead, ibid. 



Russian poplar, ibid. 



Liriodendron tulipifera, ibid. 



Cornus stolonifera, ibid. 



Cornus sericca, ibid. 



Ceanothus, ibid. 



Amelanchier canadensis, ibid. 



Chionafipisi americana Johns. 

 Ulmus americana (Johns.), Ckll., Proc. Nat. M., XIX, p. 765. 



Chionaspis platani Cooley. 

 Sycamore (Parrott), Cooley, Spec. Bull. Hatch Exp. Sta., Aug. 1899, p. 36. 



Chionaspis pinifolice Fitch. 



Pine, Comst., 2d Corn. Rept., p. 140, 1880. 



Firs and spruces, Gillette and Baker, Hemiptera of Colorado, p. 129. 



Pinus strobus, Cooley, Spec. Bull. Hatch Exp. Sta., Aug. 1899, p. 33. 



Pinus resinosa, ibid. 



Pinus excclsa, ibid. 



Pinus niitis, ibid. 



Pinus cembra, ibid. 



Pinus pyrenaica, ibid. 



Pinus laricis, ibid. 



Pinus sylvcsiris, ibid. 



Pinus austriaea, ibid. 



Pinus punilio, ibid. 



Pseudotsuga ta.rifoUa, ibid. 



Abies excelsa, ibid. 



Abies nigra, ibid. 



Abies alba, ibid, 



Pulrhurria inuutnevahilis Rathv. 



Tilia sp., Ckll., Proc. Nat. M., XIX, p. 730. 



Euonymus (Riley), Ckll., Proc. Nat. M., XIX, p. 734. 



Vitis inconstans, also on wild grape, Ckll., Proc. Nat. M., XIX, p. 735. 



Sycamore (Riley), Ckll., ibid., p. 736. 



Rosa sp., Riley, Rept. Dept. Agr., 1881. 



Garden currants, Eibes rubrum and nigrum, Riley, Rept. Dept. Agr., 1881. 



Fraxinus nigra { Sambricifolia), Mundt, Can. Ent., 1884, p. 240. 



Poplars, Populus balsamifera, ibid. 



Mulberry, Morus rubra, ibid. 



Oak, Qaercus sp., Riley, Rept. Dept. Agr., 1884. 



White elm, Ulmus americana Hunter, Q. U. Quart., IX, No. 12, p. 104. 



Black walnut, Jiiglans nigra, ibid. 



Maple, ibid. 



Silver maple, Putnam, Dav. Acad. Nat. Sci., p. 294. 



Beech, ibid. 



Sugar maple, ibid. 



Box-elder, ibid., p. 338. 



