PARTHENOGENESIS AND CROSSING-OVER IN 

 THE GROUSE LOCUST APOTETTIX^ 



PROrESSOR ROi'>i:irr k. xahoi u's 



Theee have been found among the grouse locusts, genus 

 Paratettix,^ in nature, fourteen factors for color pat- 

 terns, all in one series of multiple allelomorphs. A tif- 

 teenth factor, a modified S, in the same series, has orig- 

 inated in the laboratory by means as yet not understood. 

 Another factor, B, for melanism, discovered in nature, 

 has been found to segregate independently of the multiple 

 allelomorph group (Nabours, '14, '17). Still another 

 factor, for red-all-over, yet to be described, also from 

 nature, behaving precisely as does 6, though segregating 

 independently of both it and the multiple allelomorph 

 series, has been bred in considerable numbers. In one 

 si)c(M,.s (>r the ovinis T<trni}du,:' bred in our laboratorx , 

 til. 'IV li;,x,' iMM.n <l.-rl-il)r<l ;i M-fir. of ti\ r mullipl.- allcl.)- 



Among another genus, Apotetiix,^ of the grouse locusts 



