• Darwin Archive | 'Origin of Species': portfolios I | Materials for 'Natural Selection' chapter 4: 'Variation under nature' | NS I Chap 4-140 Printed Material, 1871-08-24 | (Trimen, Roland. Note on a curious South African grasshopper, Trachyptera bufo) 'Nature' 4: 333, 1871-08-24

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