112 ILLINOIS BIOLOGICAL MONOGRAPHS [322 



ellipsoidal in shape and is of approximately the same width as the 

 protomerite of the primite. The ratio of length protomerite : total 

 length primite (for twelve associations) remains nearly constant and 

 is approximately the same in the satellite as in the primite, being 1 : 5. 

 The ratio of width protomerite : width deutomerite of primite is ap- 

 proximately 1.5 : 1; in the satellite it is 1 : 1.4. 



The endoeyte is very dense in both protomerite and deutomerite, 

 and is brown in color, not black as in so many species. The protomerite 

 granules are much larger than those in the other species seen in the 

 same host. The nucleus is small and spherical. It is not visible in vivo 

 except in young individuals. 



Upon carefully flattening out the association on the slide, by slight 

 pressure, a large inflated papilla is seen on the anterior end of the 

 satellite, which fits into a corresponding depression in the primite and 

 makes the union firmer. This was well demonstrated in some specimens 

 from a starved host in which the protoplasm of the parasite was pale 

 tan throughout and both the papilla and the nuclei were clearly visible. 



The trophozoites possess a knob shaped hyaline epimerite. 



Cysts are 300 to 350/t in diameter*, very dense like the sporonts and 

 deep brown in color. In one cricket, all the associations were engaged 

 in cyst making. Two such processes were watched from the incipiency 

 to the completion of the two cysts, and the process took place in less 

 than half an hour. At 11 a. m., five cysts were present on another 

 slide, and at 2 p. m. there were seven. Several of the cysts which when 

 first observed were sporonts, developed to completion with the extrusion 

 of ripe spores. The maximum number of spore ducts seen on a cyst 

 was nine. The ducts are very long. The spores are barrel shaped, 

 3 by 6/t. 



It was anticipated that this species was identical with Crawley's 

 Gregarina kingi because of the peculiarly shaped protomerite of that 

 species, but such was found not to be the case ; the two species differ 

 in many respects. The following table indicates the chief differences: 



*The diameter, exclusive of the transparent layer, is 50/1 less. 



