190 ILLINOIS BIOLOGICAL MONOGRAPHS [400 



the satellite. The individuals of an association are easily detached by- 

 slight pressure. 



In color, this species is dark and gray, especially in the deutomerite ; 

 the protomerite is less dense. The nucleus is not visible in the live animal. 



Trophozoites and cysts were not seen. 



A table of measurements, in which dimensions are given in microns, 

 follows : 



Total length association 320 304 



Primite : 



Length protomerite „. 40 33 30 35 



Length deutomerite 120 137 130 135 



Width protomerite 45 42 42 55 



Width deutomerite - 80 80 70 82 



Total length sporont 160 170 150 170 



Ratio 



length protom. : total length 1 :4 1 :5 1 :5 1 :5 



width protom. : width deutomerite 1 :2 1 :2 1 :1.6 1 :1.5 



Satellite : 



Length protomerite _ 30 20 



Length deutomerite 130 114 



Width protomerite 50 32 



Width deutomerite 70 75 



Total length sporont 160 134 



Ratio 



length protom. : total length _ 1 :5.3 1 :6.7 



width protom. : width deutomerite 1 :1.4 1 :2.3 



GREGARINA MONARCHIA Watson 



[Figure 167] 



1915 Gregarina monarchia Watson 1915 :31 



Host -.Pterostichus stygicus (Say). 

 Location : Urbana, Illinois, November, 1914. 



Only one parasite was seen in the intestine of the host. The same 

 beetle was infected with Gregarina fragilis. 



The sporonts are biassoeiative. The body is very long and sausage 

 shaped, easily visible to the eye. The protomerite of the primite is dome 

 shaped, widest just below the middle portion, is but little wider than high, 

 and in length equal to one seventh the total length of the sporont. There 

 is a deep constriction at the septum. The deutomerite is cylindrical, of 



