Contents 



Studies on chromosomes 



I. The behavior of the idiochromosomes in 

 Hemiptera. 



II. The paired Mi crochromo somes , idiochromo- 

 somes and heterotropic, chromosomes in 

 Hemiptera. 



III. The sexual differences of the Chromosome- 

 groups in Hempitera, with some considera- 

 tions of the determination and inheritance 

 of sex. 



IV. The "accessory" chromosome in Syromastes 

 and Pyrrochoris with a comparative review 

 of the types of sexual differences of the 

 chromosome groups. 



V. The chromosomes of Metapodius, a contribu- 

 tion to the hypothesis of the genetic con- 



tinuity of chromosomes. 



VI. A new type of chromosome combination in 

 inoteipha.se. 



VII. A review of the chromosomes of Nezara; 

 with some more general considerations. 



VIII. Observations on the maturation- phenome- 

 na in certain Hempitera and other fonns 

 with considerations on synapsis and re- 

 duction. 



967569 



