319] 



STUDIES ON GREG ARINES WATSON 



109 



protomerite and deutomerite and is black in transmitted light. The 

 nucleus is not visible in vivo. 



Cephalonts and cysts were not recovered from the host. 



A table of measurements in which all dimensions are given in 

 microns follows: 



1110 1110 



Total length association _ 



Primite 



Length protomerite 

 Length deutomerite 

 Width protomerite .. 

 Width deutomerite _ 

 Total length sporon 

 Eatio 



length protom. : total length sporont._l :5.5 

 width protom.: width deutomerite.-l :1.3 

 Satellite 



70 



530 



_ 130 



190 



.. 560 



1080 1050 



Length protomerite 

 Length deutomerite 

 Width protomerite . 

 Width deutomerite . 



Total length sporont 



Ratio 



length protom. : total length sporont... 1 :8 



width protom. : width deutomerite.-l :1.5 



This species and the Old World Gregarina Uattarum Sieb. of Blatta 

 orientalis are differentiated as follows: 



1:5.5 

 1:1.4 



130 



430 

 130 

 210 

 560 



1:4.3 

 1:1.6 



1:5.4 

 1:1.7 



80 

 440 

 130 

 170 

 520 



1:6.5 

 1:1.3 



1:5.5 

 1:1.5 



70 

 480 

 120 

 180 

 550 



1:8 

 1:1.5 



Shape 



Posterior end satellite 



Sarcoeyte 



Shape protomerite of 

 satellite 



G. Uattarum 

 Irregularly cylindrical 



Not well rounded, 



often pointed 

 Very thick 



Flattened, wider at 

 base than elsewhere 



1.7 times as wide as 

 at top, 2.5 times as 

 wide as high 



G. illinensis 

 Very regularly cylin- 

 drical 

 Well rounded always 



Thin except in proto- 

 merite 



But slightly flattened, 

 as wide at base as at 

 top, 1.5 times as wide 

 as high 



