407] STUDIES ON GREGARINES WATSON 197 



visible in vivo as an ellipsoidal body twice as long as wide and contain- 

 ing one large karyosome. Trophozoites and cysts have not been ob- 

 served. 



Measurements are as follows with dimensions given in microns : 



Total length sporont 210 125 



Length protomerite 30 18 



Length deutomerite 180 107 



Width protomerite 35 28 



Width deutomerite 80 38 



Ratio 



length protom. : total length 1:7 1 :7 



width protom. : width deutomerite 1 :2*3 1 :1.3 



Nucleus .41 by 20 23 by 10 



It is very probable that these specimens are not members of the 

 genus Gregarina. The ellipsoidal nucleus is like that of some of the Ac- 

 tinocephalidae. No attempt is made to place the specimens, and they are 

 mentioned for the completeness of the record only. 



STYLOCEPHALUS sp. 

 [Figure 65] 



?1875 Stylocephalus longicollis Schneider 1875 : PI. xix, fig. 2 



The following description is copied from Crawley (1903:47) : 

 "Gregarina xylopini Crawley. 



The two gregarines shown in figures 29 and 30 are stated by Leidy to be 

 parasites of the beetle Xylopinus saperdioides. Of the six beetles examined, five 

 contained gregarines of the form shown in figure 29, one of the form shown in 

 figure 30. These two forms are so dissimilar that it appears better, at present, to 

 give only the figures, reserving the description until additional information is at 

 hand." 



Figure 29 is reproduced in my figure 65; figure 30 in my figure 134. 

 The first gregarine agrees in appearance with sporonts of Schneider. 



Ellis considers it as synonymous with his Actinocephalus zophus. 

 I do not, however, regard it as such, but as a separate species. See dis- 

 cussion under A. zophus. 



The second gregarine, (Figure 134) is -evidently a specimen of Greg- 

 arina cuneata. The host is one of the Tenebrionidae and the drawing 

 compares very favorably with the others listed under G. cuneata Stein. 



