No. 613] SHORTER ARTICLES, DISCUSSIO 



REVIEWS 61 



intensity of the linkage in the material at his disposal to be 

 equivalent to 26.7 per cent, of crossing over. 



(6) It has been shown directly, by means of crosses between 

 colorless individuals in a linkage family and aleurone testers and 

 indirectly by means of aleurone tests with a non-linkage family 

 where the A factor and not the C factor is heterozygous, that the 

 C factor for aleurone is linked with the factor for waxy endo- 



T. Bregger 



INHERITANCE IN ORTHOPTERA 



In a recent paper (Nabours, 17) Nabours has continued his 

 admirable studies of inheritance in Paratettix. The paper is 

 backed up with an abundance of data, from which a number of 

 facts are deduced. In his discussion, he attacks certain modern 

 hypotheses, and since it appears to me that his strictures are 

 not entirely justified, I venture here to review the evidence, and 

 make certain comments on it. 



The following facts, several of which were well brought out 

 in a previous paper (Nabours, 14), are presented: 



1. A large number of distinct, true-breeding forms of Para- 

 tettix occur "in nature." Of these he has collected at least 

 fourteen or fifteen. He no longer looks upon each as a distinct 

 speeies, and he has dropped the "specific names" he suggested 

 for them in the previous paper. 



2. The distinguishing characteristics of these forms fall into 

 two groups in their mode of inheritance : (a) Fourteen color pat- 

 terns act as allelomorphs to each other. (6) A fifteenth pattern 

 is ' ' allelomorphic only to its absence." 



3. One of the characters of the "multiple allelomorph" group 

 does not always act as an allelomorph to the other members of the 

 group. This is the character I of his first paper, which was 

 noted then for the same behavior. Rather, it behaves (to put it 

 briefly, but in words very different from Nabours 's) as if it 

 were closely but not completely linked to the others. 



Because I wrote a review of Nabours 's first paper on this sub- 

 ject (Dexter, 14), I feel a certain responsibility for what I think 

 are mistaken viewpoints concerning the multiple-allelomorph- 

 nature of this group. 



