170 Inheritance and Evolution in Orthoptera I 



Prof. C. O. Whitman first suggested the problem and introduced me 

 to Dr J. L. Hancock who has given valuable aid in the Taxonomy and 

 Natural History of the material. To these friends I am grateful for 

 invaluable assistance and encouragement. 



EXPLANATION OF PLATE VI. 



Most of the photographs are of females, the patterns of both males and females being 

 the same. The difference in sizes is not significant, being due to the scale of the 

 photographs. 



The top row represents the true breeding forms. The middle and lower rows repre- 

 sent eighteen of the heterozygous forms derived from crossing the pure strains. CG, CI, 

 FH, and EH are modified photographs, the patterns of the rest being untouched or only 

 tinted. 



BIBLIOGRAPHY. 



1. 1909. Bateson, W. ''Mendel's Principles of Heredity." Cambridge Uni- 

 versity Press. 



2. 1907. Davenport, C. B. "Heredity and Mendel's Law." Proceedings of 

 the Washington Academy of Sciences^ Vol. ix. p. 179. 



3. 1910. DoNCASTER, L. " Heredity in the Light of Recent Research." Cam- 

 bridge University Press. 



4. 1902. Hancock, J. L. "The Tettigidae of North America." Chicago. 



5. 1911. JoHANNSEN, W. " The Genotype Conception of Heredity." American 

 Naturalist, Vol. xlv. No. 531. 



6. 1907. LuTZ, Frank E. "The Variation and Correlation of the Taxonomic 

 Characters of Gryllus." Carnegie Inst. Piib. 101. 



7. 1910. Montgomery, T. H. "Are Particular Chromosomes Sex Deter- 

 minants?" Biological Bulletin, xix. No. i, pp. 1 — 17. 



8. 1910. Tower, W. L. "The Determination of Dominance and the Modi- 

 fication of Behaviour in Alternative (Mendelian) Inheritance by Conditions 

 Surrounding or Incident upon the Germ Cells at Fertilization." Biological 

 Bulletin, xviii. pp. 285 — 337. 



9. 1893. Whitman, C. 0. "The Inadequacy of the Cell Theory of Develop- 

 ment." Woods Hole Biological Lectures. 



