365] STUDIES ON GREGARINES— WATSON 155 



the trophozoite is attached, only the epimerite is embedded and the free 

 ends of several cells are destroyed by the parasite. 



Very slow movement of progression was noted. The power of con- 

 traction seems to be centered in the anterior part of the deutomerite, 

 for the parasite is able to contract this portion of the body into a narrow 

 neck. 



This species is very probably a member of the genus Steinina, fam- 

 ily Actinocephalidae, although the cysts and spores are not known. The 

 globular hyaline epimerite corresponds to that of one stage of the epime- 

 rite of the type species, Steinina ovalis, as described by Leger and Du- 

 boscq (1904:352-4). The incipient stylous epimerite and the hat shaped 

 end stage were not observed in this species. The adults are non-associa- 

 tive and in shape of the deutomerite, of the protomerite, and the conoi- 

 dal anterior projection of the protomerite, together with the nuclear 

 shape and content, coincide with those of the type species. Coupling 

 of sporonts takes place probably just previous to cyst formation and not, 

 as in the genus Gregarina, near the beginning of sporont life. 



Some of the important measurements are given below; all dimen- 

 sions are expressed in microns : 



Total length sporont 250 220 180 



Length protomerite with epimerite 130 105 70 



Length epimerite 20 20 15 



Length protomerite without epimerite 110 85 56 



Length deutomerite 120 115 110 



Width protomerite _ 130 90 70 



Width deutomerite 150 120 85 



Ratio 



length protom. (without epimerite) : total length...l :2.3 1 :2.5 1 :3.3 



width protom.: width deutomerite „ 1:1.1 1:1.3 1:1.2 



Diameter nucleus „ 40 32 40 



STEININA HARPALI nov. spec. 

 [Figures 256-59, 269] 



Host: Harpalus pennsylvanicus longior (Kirby). 



Location, Urbana, 111., June, 1915. 



The parasites were found in the coelom, attached to the intestinal 

 walls of several beetles. The sporonts are solitary, small and obese. The 

 maximum recorded length is 200/x, the average length 150ju, and the max- 

 imum width lOOfi. The ratio of length protomerite : total length with- 

 out primite : : 1 : 3 to 1 : 5 and the average ratio of width protomerite : 



