100 ILLINOIS BIOLOGICAL MONOGRAPHS [310 



Leidy described briefly Oregarina hlattae orientalis from the United 

 States, which species proved to be synonymous with the earlier named 

 species, coinciding in measurements, proportions and host. 



Schneider gave a brief description, with good figures of an associa- 

 tion and of a dehiscing cyst. 



Biitschli admirably described the process of cyst formation from be- 

 ginning to end, a process never before seen and very rarely described 

 since. 



Wolters observed some of the nuclear changes in the cyst. 



Marshall contributed the third long paper on development. 



deMagalhaes found the species in Brazil in 1900; three years later 

 Crawley found it in the United States, both from the original host. The 

 specimens found by these workers were undoubtedly those of the true 

 old-world G. hlattarum. The shape and proportions correspond, and in 

 hosts of the nature of the cockroach, there is little wonder that botli host 

 and parasites are widely distributed. 



GREGARINA LOCUSTAE Lankester 



[Figure 188] 



1853 Gregarina Locustae Carolinae Leidy 1853 :239 



1856 Gregarina Locustae Carolinae Leidy 1856 :47 



1859 Gregarina fimhriata Diesing 1859 :730 



1863 Gregarina Locustae Lankester 1863 :94 



1899 Gregarina locustaecarolinae Labbe 1899:35 



1903 Stephanophora locustaecarolinae Crawley 1903 :54 



1907 Gregarina locustaecarolhiae Crawley 1907:225 



1913 Gregarina locustaecarolinae Ellis 1913b :268 



Gregarina: Sporouts biassociative. Maximum length of sporonts 

 350/t, average length 250|U,. Ratio length protomerite : total length pri- 

 mite : : 1 : 6.8 ; width protomerite : width deutomerite : : 1 : 1.7. Proto- 

 merite a little more than hemispherical, one and one half times as wide 

 as high. Deutomerite cylindrical, rather square cornered posteriorly, 

 nearly twice as wide as the protomerite. Nucleaus large, spherical, with 

 one karyosome. Epimerite a small rounded knob with a very short neck. 



Taken at Philadelphia and Wyncote, Pa. Host: Dissosteria Caro- 

 lina (L.) Habitat: Intestine. 



Crawley recognized (1907) the fact that Leidy described and illus- 

 trated two distinct species under the same name. Leidy 's figures 35 

 and 36 (1853), the former my figure 188, represent isolated sporonts 

 typical of the genus Gregarina in relative strength and width of proto- 



