CHROMOSOME STUDIES IN TETTIGID^. 223 



of the growh period by an end to end union of the homologous 

 pairs of chromosomes. 



7. The chromatin of the sex-chromosomes does not lose its 

 identity during the growth period. 



8. The first maturation division is a reductional division, and 

 the second maturation division is equational. 



9. The formation of the diploid number of chromosomes at 

 the end of the growth period and the union of their homologous 

 pairs by telosynapsis may explain the absence of any crossing- 

 over in Paratettix. 



LITERATURE CITED. 

 Baumgartner, W. J. 



'04 Some New Evidence for the Individuality of Chromosomes. BIOL. BULL., 



Vol. 8. 

 Bellamy, A. W. 



'17 Studies of Inheritance and Evolution in Orthoptera, IV. Multiple Allelo- 

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'17 Non-disjunction as a Proof of the Chromosome Theory of Heredity. Gen ., 



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 Brunelli, G. 



'09 La spermatogenesi del Gryllus desertus Pall. (Division! spermatogoniali 



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della Societa Italiana Scienze, T. 16, serie 33. 

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Jour. Morph., Vol. 24. 

 Davis, H. S. 



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etc. Zeit. Abst. Vererb., Bd. 9. 

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'14 On Hybrids between Moths of the Geometrid Subfamily Bistoninse, with 

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