395] STUDIES ON GREGARINES— WATSON 185 



A list of the essential measurements with dimensions in microns is 

 appended : 



Total length association 283 275 220 192 



Primite : 



Length protomerite 17 22 25 20 



Length deutomerite 103 113 120 105 



Width protomerite 28 40 40 40 



Width deutomerite 80 90 90 75 



Total length sporont 120 135 145 125 



Ratio 



length protom. : total length 1 :7 1 :6 1 :5.8 1 -.6.2 



width protom. : width deutomerite 1 :2.5 1 :2.2 1 -.2.2 1 :1.9 



Satellite : 



Length protomerite 17 10 18 15 



Length deutomerite 46 130 57 52 



Width protomerite 65 55 60 40 



Width deutomerite 80 80 80 68 



Ratio 



length protom.: total length 1:9.2 1:14 1:4.2 1:4.5 



width protom. : width deutomerite 1 :1.2 1 :1.4 1 :1.3 1 :1.7 



Diameter nucleus 10 



This species is considerably larger than Gregarina katherina. 



GREGARINA FRAGILIS Watson 

 [Figure 175] 

 1915 Gregarina fragilis Watson . 1915 :32 



Host: Coccinella sp. 

 Location: Urbana, Illinois, November, 1914. 



The intestine of the host is the seat of infection. Out of thirty or 

 more lady beetles of many species which were examined, only two jdelded 

 parasites. About twenty-five associations were found in the two hosts. 



The sporouts are biassociative. The protomerite of the primite is 

 cylindrical, rounded at the corners and nearly flattened anteriorly ; it is 

 about 1 2/3 times as wide as high. A shallow constriction or none at all 

 is present at the septum. In the satellite, the protomerite is altered 

 slightly in shape, being both flattened and broadened. The deutomerite is 

 subglobular, widest in the middle or slightly posterior to the middle and 

 terminates in a broadly rounded extremity. The satellite is smaller than 

 the primite and less nearly globular in shape. 



