184 ILLINOIS BIOLOGICAL MONOGRAPHS [394 



GREGARINA BARBARARA Watson 



[Figure 169] 



1915 Gregarina larbarara Watson 1915:31 



Host : Coccinella sp. 



Fourteen lady beetles were examined and only two were parasitized, 

 one with this species and the other with the preceding species. Sixteen 

 associations of the present species were found in the one host. The re- 

 gion of infection is the intestine. 



The adult sporonts are biassociative. In shape they are similar to 

 other members of this genus. The primite is not essentially different in 

 shape from that of G. katherina. The protomerites of the primite in 

 the two species are identical, viz. 1 1/4 to 1 1/2 times as broad as high, 

 cylindrical at the base and terminating in a broadly rounded, often api- 

 cally flattened anterior extremity. The deutomerite of the primite of 

 this species is more nearly globular, broadening appreciably backwards 

 from the septum and attaining its greatest width in the middle or at the 

 beginning of the posterior two thirds of the body. From here the deuto- 

 merite rapidly contracts, ending in a very broadly rounded and not 

 flattened posterior end. The shape of the satellite is quite different 

 from that of the primite. It has the form of an elongated egg smaller at 

 the posterior end. The satellite is generally longer than but is never as 

 wide as the primite. The protomerite is very different from that of G. 

 katherina. It is approximately five times as wide as high, and twice as 

 wide as the protomerite of the primite. It is broadly rounded in front 

 and but imperfectly interlocked with the primite. The septum is 

 straight or slightly concave upward, with no constriction whatever at 

 its periphery, the protomerite and deutomerite forming a perfectly 

 smooth contour at the edges of the septum. The deutomerite of the sat- 

 ellite is widest a little behind the septum and anterior to the center of 

 the egg shaped mass. The body gradually tapers from the region of 

 greatest width, ending in a blunt, well rounded extremity. 



This parasite is practically transparent with a few large scattered 

 darkly colored protoplasmic granules accumulated in the central re- 

 gions of the deutomerite of the primite; the satellite is generally free 

 from these dark colored inclusions. The nucleus is rarely obscured by 

 protoplasm; it is small and spherical. 



The epicyte is very thin and fragile and the animals quickly break 

 up when exposed to the diluted digestive juices of the host. 



