399] STUDIES ON GREGARINES— WATSON 189 



small and spherical, containing one small karyosome. In one instance, 

 the chromatin was arranged outside the karyosome as in the spokes of a 

 wheel, the karyosome forming the eccentric hub. The epicyte is very thin 

 and of even width throughout. 



A table of measurements of sporonts follows ; the dimensions are ex- 

 pressed in microns : 



Total length association „ 368 355 310 237 



Primite : 



Length protomerite 20 20 21 20 



Length deutomerite 158 105 129 97 



Width protomerite 35 30 30 23 



Width deutomerite „ 75 50 57 41 



Total length sporont 178 125 150 117 



Ratio 



length protom. : total length 1:8.9 1:6.2 1:7.1 1:5.8 



width protom. : width deutomerite 1 :2.1 1 :1.7 1 :1.9 1 :1.9 



Satellite : 



Length protomerite 21 20 20 20 



Length deutomerite 169 160 140 100 



Width protomerite 41 35 35 32 



Width deutomerite 80 75 65 45 



Total length sporont 190 180 160 120 



Ratio 



length protom. : total length 1 :9 1 :9 1:8 1:6 



width protom. : width deutomerite 1 :2 1 :2.1 1 :1.9 1 :1.4 



GREGARINA INTESTINALIS Watson 

 [Figure 168] 

 1915 Gregarina intestinalis Watson 1915 :32 



Host: Pterostichvs stygicus (Say) 

 Location : Urbana, Illinois, November, 1914. 



A dozen associations were found in the intestine of one beetle. The 

 beetle was also infected with Gregarina monarchia. 



The sporonts are biassociative. The body is ellipsoidal to subglobose. 

 The protomerite of the primite is subspherical, well rounded in front, 

 widest along the center, equal in width to one fourth to one sixth the 

 width of the deutomerite, and one fifth the total length. There is a fairly 

 deep constriction at the septum. The deutomerite is egg-shaped, widest 

 about the middle portion or slightly posterior to the middle. The poste- 

 rior end is broadly rounded in the primite and slightly more tapering in 



