327] STUDIES ON GREGARINES— WATSON 117 



A table of measurements follows in which all dimensions are given 

 in microns: 



Total length association 990 880 1000 



Primite : 



Length protomerite -. 140 150 150 



Length deiitomerite 390 290 380 



Width protomerite 120 130 140 



Width deutomerite 150 170 180 



Total length sporont 530 440 530 



Ratio 



length protom. : total length 1 :3.8 1 :3 1 :3.5 



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



Satellite : 



Length protomerite 110 100 90 



Length deutomerite _ 350 340 380 



Width protomerite 110 120 130 



Width deutomerite 170 150 160 



Total length sporont 460 440 470 



Ratio 



length protom. : total length 1 :4.2 1 :4.4 1 :5.2 



width protom. : width deutomerite 1 :1,5 1 :1.2 1 :1.2 



GREGARINA UDEOPSYLLAE nov. spec. 



[Figures 260, 261] 



Host: Udeopsylla nigra (Locustidae). Location, Urbana, 111. 



Three specimens of this rare host were examined and all found to be 

 moderately infected with an hitlierto undescribed gregarine. The para- 

 sites lay in inert masses in the mid intestine. 



The sporonts are biassociative and obese. The maximum observed 

 length for an association was 600/a, The largest primite was 310/a long 

 and 200/X, wide. The average ratio of length protomerite : total length 

 sporont was 1 : 5.2, and the ratio of width protomerite : Avidth deutome- 

 rite : : 1 : 5. The sporont is elongate ellipsoidal in shape. The protome- 

 rite of the primite is slightly longer than wide, widest in the central por- 

 tion, and terminates in a small cone. There is a deep constriction at the 

 septum. The deutomerite is widest in the middle, and the satellite termi- 

 nates in a broadly rounded extremity. The protomerite of the satellite 

 is broad and shallow and from two to three times as wide as long. An in- 

 aentation is present in the anterior end of each protomerite of an asso- 

 ciation. 



