168 ILLINOIS BIOLOGICAL MONOGRAPHS [378 



HIRMOCYSTIS HARPALI NOV. SPEC. 

 [Figures 265, 266, 267, 268, 273, 274] 

 Host: Harpalus pennsylvanicus erythropus (Dej.). 

 Location Urbana, Illinois, June, 1915. 



This species was found very abundant 'in the intestines of four 

 beetles examined, one containing at least a thousand associations. The 

 sporonts were found in linear associations of twos, threes and fours and 

 each sporont is elongate cylindrical in shape. The maximum length of 

 associations found was 1060/A, maximum length of sporonts 560/4, and 

 maximum width 80/A. Ratio length protomerite : total length : : 1 : 7 ; 

 r^tio width protomerite : width deutomerite :: 1 : 1.2. The proto- 

 merite of the primite is dome shaped, a little wider than long and con- 

 stricted at the septum, but not deeply so. The deutomerite is elongate, 

 seven times as long as the protomerite and well rounded at the posterior 

 end. The protomerite of the satellite is very much flattened, twice as 

 wide as high and not deeply constricted at the septum. The primite 

 fits into a very deep concavity in the protomerite of the satellite (See 

 Fig. 274). 



The protoplasm is very dense, black in the deutomerite and much 

 less dense, and tan in color, in the protomerite. The nucleus is spherical 

 and contains one karyosome visible in adults as a clear spot. 



The epimerite is large and spherical (Fig. 268). Myonemes are 

 very conspicuous as a horizontal network. Cysts were not seen. 



A few measurements are as follows, all dimensions being given in 

 microns : 



Total length of associations 1060 910 730 



Primite : 



Length protomerite - - 80 60 60 



Length deutomerite - 480 440 300 



Width protomerite 70 60 50 



Width deutomerite - 80 90 60 



Total length sporont 560 500 360 



Ratio 



length protom.: total length 1:7 1:8.3 1:6 



width protom.: width deutomerite 1:1.1 1:1.5 1:2 



Nucleus, diameter 50 



