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—— Systematic position of the Orthoptera in relation to other insects. (Third report U. S. Ent. Commission, pp. 286–345, 1883, Pls. xxiii-lxi.)
Graber, Vitus. Die Insekten. 12º, pp. 403, 603, München, 1877, many Figs.
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—— Systematisch-zoologische Studien. (Ibid., 1885, pp. 237–413.)
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