474 E. ELEANOR CAROTHERS 



morphologically different sorts of second spermatocytes as 

 follows : 



11 with 3 atelomitic dyads (fig. 63d) 



11 with 4 atelomitic dyads (fig. 63c) 



12 with 4 atelomitic dyads (fig. 636) 

 12 with 5 atelomitic dyads (fig. 63e) 



The transformation stages which result in the mature sperma- 

 tozoa appear to be perfectly normal throughout the collection. 



c. Circotettix. Circotettix does not differ from the species 

 just described so far as the formation of different types of sperma- 

 tids is concerned. But we have the important difference that 

 the numbers are ten and eleven (barring the supernumeraries 

 -which are present in two of the specimens) instead of the usual 

 eleven and twelve. Complexes from two individuals are shown 

 in figures 69a, 696 and 706, 70c (plate 13). 



111. SUMMARY OF OBSERVATIONS 



1. The number of spermatogonial chromosomes in Trimero- 

 tropis is twenty-three. Anywhere from seven to seventeen of 

 these have been found to be atelomitic, but the number of such 

 chromosomes is constant in a given individual. 



2. The number of spermatogonial chromosomes in Circo- 

 tettix is twenty-one. Nine to thirteen of these have been found 

 to be atelomitic in different individuals. The number of atel- 

 omitic chromosomes is constant for the individual. 



3. The number of somatic chromosomes in the female of 

 Trimerotropis is twenty-four. The number of atelomitic chro- 

 mosomes varies in different individuals from eight to fifteen, 

 but is constant for the individual. 



4. The number of chromosomes in the first spermatocyte 

 of Trimerotropis fallax is twelve, of Circotettix eleven. 



5. Certain individuals may possess one or two supernumerary 

 chromosomes. These bodies divide in the spermatogonia, pass 

 to one pole undivided in the first spermatocyte division and 

 divide in the second spermatocyte. They segregate in the 



