CHROMOSOMES OF THE REDUVIIDAE 



335 



divided to the opposite pole. This gives two classes of sperma- 

 tozoa, one with fourteen chromosomes and the other with eleven, 

 and the fertilization formula would be as follows: 



The chromosomes of PseUiodes cinctus Fabr. also deserve men- 

 tion. As shown in figure 3, the type of distribution is similar to 







B 









D 



' * • • 





••• 



Fig. 2 Pnirontis modesta Banks. A, B and C, spermatogonia! divisions show- 

 ing twenty-five chromosomes ; D and E, first spermatocyte divisions with fifteen 

 chromosomes (the five small ones are the idiochromosomes); F, second spermato- 

 cyte division, showing ten chromosomes in the ring and the one idiochromosome 

 (F element) which lies in a different plane from the other four; G, second sper- 

 matocyte division with ten chromosomes in the ring and the four idiochromo- 

 somes which lie in the same plane; H, side view of the second maturation division 

 showing the single idiochromosome below and the four above massed together as a 

 single body. X 2275. 



that described for Prionidus cristatus and Sinea diadema (Payne, 

 '09). The size relations of the idiochromosomes, however, are 

 different. In Sinea all four were practically the same size; in 

 Prionidus one was shghtly larger than the other three; while 

 in Pselliodes the single chromosome, the homologue of the small 

 idiochromosome (F element), is much larger than the others; 



