1903.] NATURAL SCIENCES OF PHILADELPHIA. 47 



? Gregarina discaeli sp. n. PL I, figs. 7-10. 



Epimerite: ?. 



Protomerite: Helmet-shaped to pentagonal. Separated, from the 

 deutomerite by a shallow constriction in the adults, by a deep constric- 

 tion in the young. 



Deutomerite: Greatty elongated, cylindrical to slightly conical, termi- 

 nating bluntly. 



Epicyte: Very thin. Longitudinal striations not evident. 



Sarcocyte: Apparently wanting. 



Endocyte: Densely granular and opaque in the deutomerite; nearly 

 transparent in the protomerite. Anterior part of protomerite free from 

 granules. 



Nucleus: Not readily seen, but apparently possessed of a number of 

 karyosomes disposed in a cluster. 



Dimensions: Maximum length 1200 microns. In the young the 

 ratio of length to breadth is about eight to one, in the adults about 

 fifteen to one. 



Movements: These gregarines possess the flexibility of an eel. They 

 frequently bent themselves into crescents, circles and short, close spi- 

 rals, this last phenomenon demonstrating the spirality of the myocyte. 

 Fig. 10 shows the longitudinal axis of one contorted animal observed, 

 A being the anterior and P the posterior end. 



Host: Disccelus ovalis. Of the two beetles examined, one contained 

 from 50-75 parasites; the other not nearly so many. 



Locality: Wyncote, Pa. 



No cases of association were seen, but for the most part these greg- 

 arines were disposed in dense bunches with their posterior ends glued 

 together. There was one such mass seen which presented the appear- 

 ance of a bunch of celery, the animals being all closely apposed from 

 their posterior ends nearly as far forward as their protomerites. 

 1 Gregarina xylopini sp. n.i PL III, figs. 20, 30. 



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

 parasites of the beetle Xylopinus saperdoides. Of the six beetles exam- 

 ined, five contained gregarines of the form shown in fig. 29, one of the 

 form shown in fig. 30. These two forms are so dissimilar that it appears 

 better, at present, to give only the figures, reserving the description 

 imtil additional information is at hand. 

 ? Gregarina boletophagi sp. n.- PL IT, figs. 20-2^. 



Epimerite: ?. 



Protomerite: Large, variable in shape. Separated from deutomerite 

 by a sharp constriction. 



' From Leidy's MSS. '' From Leidy's MSS. 



