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30. 1900—Pergande, Theo., Prac. Acad. Sci. Wash. II, p. 516. 
31.2 17——Reaumur, II], pl. 22, Fig. 2. 
32. 1898—Rubsaamen, Bibl. Zool. XX. p.? 
33. 1801—Schrank, Fauna Boica II, p. 102. 
33a. 1900—Schouteden, H., Ann. Soc. Ent. Gelg. XLIV, p. 128. 
34. 1906—Schouteden, H., Ann. Soc. Ent. Belg. I. 
35. 1879—Thomas, C., Eight Rept. State Ent. III. p. 200. 
36. 1889—Weed, C. M., Psyche V, 208-209. 
37. 1890—Weed, C. M., Ohio Agr. Exp. Sta. Bull. Tec. Ser. I. No. 2. Fig. 
38. 1891—Weed, C. M., Insect Life III, 290-292. 
39. 1893—Weed, C. M., Trans. Amer. Ent. Soc. XX, p. 300. 
40. 1861—Walsh, B. D., Prac. Ent. Soc. Phil. I. p. 298. 
41. 1891—Williams, T. A., Dept. of Ent. Univ. of Nebraska sp. Bull. 1. 
42. 1911—Williams, T. A., The Aphid Neb. Univ. Studies X, No. 2, p. 34. 
43. 1910—Wilson, H. F., Canadian Ent. XLII, p. 384. 
44. 1915—Wilson, H. F., Proceedings Ent. Soc. British Columbia, No. 5, N.S. 
p. 84. 
