CHROMOSOMES OF THE REDUVIIDAE 



339 



and eighty-five counts gave one hundred and fifty cases with the 

 normal number and thirty-five with thirteen and fourteen. Figure 

 5, A, B, C and D show polar views of such metaphases. In C and 

 D the granules are near the periphery of the cell and perhaps in 

 these cases would not be taken for chromosomes, E, F, G and H 

 show clearly that these granules may lie in any plane and that 

 they do not divide. 



•••• /••• 



A B 



Fig. 5 Conorhinus sanguisugus Lee. ^4. and B, metaphase plates of the second 

 spermatocyte division showing a single granule (g) lying just outside the ring of 

 chromosomes; C and D, metaphase plates of the second maturation division show- 

 ing two granules near the periphery of the cells; E, metaphase plate, side view 

 showing two small granules ; F, G and H, anaphases, side view, of the second matu- 

 ration division, showing that the granules do not divide and may pass into either 

 daughter cell. X 2275. 



In these cases, then, what might be termed chromosomal 

 A'ariation is not variation at all, but is due to the presence of 

 yolk granules which may happen to lie in the metaphase plate. 

 It is a significant fact that in these counts not a single one fell 

 below the normal number. This is also illustrated in Reduvius 

 personatus where ninety-eight counts of the first maturation divi- 

 sion gave ninety-six with the normal number (twelve) and two 

 with thirteen. Eighty-four counts of the second division gave 



