spermatogenesis 507 



It may pass through both forms in different stages, as in Entiha 

 sinuata. 



3 In the spermatids of 19 species; that is, all except three of the 

 Membracidc'e, there is a chromatin nucleolus in all of the sperma- 

 tids entirely independent of the odd chromosome. In seven of 

 these species, the odd chromosome is present also in half of the 

 spermatids, in others there is no indication of it. In the three 

 Membracidae without the chromatin nucleolus, Entilia sinuata, 

 Vanduzea arcuata, and Campylenchia curvata, the odd chromo- 

 some is present in half of the spermatids. 



4 In the genus Ceresa, in the contraction stage some of the 

 basichromatin is thrown out from the chromatin loops and per- 

 sists through the growth period as a chromatin deposition on the 

 nuclear membrane and finally dissolves without apparently taking 

 part in the formation of the chromosomes for the first spermato- 

 cyte division. 



5 In three species, Campylenchia curvata, PcEciloptera septen- 

 trionalis, and Poeciloptera pruinosa, a pair of m-chromosomes 

 remain condensed in the growth period. 



6 The number of chromosomes has no significance for group- 

 ing species into families. In reduced number, 



in the Membracidae, 5 species have 11 chromosomes 

 2 species have 10 chromosomes 



1 species has 9 chromosomes 



in the Jassidae, 2 species have 12 chromosomes 



2 species have 11 chromosomes 

 I species has 9 chromosomes 

 I species has 8 chromosomes 



in the Cercopidae, i species has 14 chromosomes 



I species has 12 chromosomes 



I species has 1 1 chromosomes 



1 species has 8 chromosomes 



in the Fulgoridae, 2 species have 14 chromosomes 



2 species have 13 chromosomes 



7 The number of chromosomes has no significance for group- 

 ing species into genera. 



