114 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[324 



Measurements of a few associations 

 in microns are as follows: 



Total length association 590 



Primite : 



Length protomerite 60 



Length deutomerite 230 



Width protomerite 150 



Width deutomerite _ 130 



Total length sporont 290 



Eatio 



length protom. : total length 1 :5 



width protom. : width deutomerite 1 :1.1 

 Satellite : 



Length protomerite 50 



Length deutomerite 250 



Width protomerite 110 



Width deutomerite 150 



Total length sporont 300 



Eatio 



length protom. : total length 1 :6 



width protom. : width deutomerite 1 :1.3 

 Diameter cysts '. 350 



with all dimensions expressed 



570 540 



490 



440 



GEEGAEINA STYGIA Watson 



[Figure 206] 



Watson 



1915:33 



1915 Gregarina stygia 



This new species was taken from Ceuthophilus stygius (Scudder), 

 hosts found in an unused cistern on Dr. C. B. Davenport's grounds, at 

 Cold Spring Harbor, L. I. 



The infection was heavy, as many as five hundred parasites being 

 found in each of several hosts, and each of the twelve examined con- 

 tained at least a few parasites. The region of infection is the intestine. 



The sporonts are biassociative as adults. The longest association 

 measured 360)U,. The sporonts are barrel shaped, the maximum length 

 recorded being ISOyu, and the maximum width lOO/t. The protomerite is 

 nearly hemispherical in the primite and is flattened in the satellite. The 

 deutomerite is widest at or in front of the middle portion. The satellite 

 is somewhat more slender than the primite and is of the same length or 

 a little shorter. The endocyte is dark tan in color, not very dense in 

 either deutomerite or protomerite, and the nucleus is easily visible in 



