244 ON A NEW SPECIES OF LOPHOMONAS. [Mar. 15, 



la some cases NyctotJierus ovalis Leidy, and almost always 

 LopJiomonas hlattarum Stein, accompanied it, but neither of these 

 species was at any time taken in any other part of the alimentary 

 canal. This perhaps is due to the salivary excretion exercising a 

 poisonous influence on these animals. This view was suggested 

 by one of the observations of Professor G-rassi and Dr. Sandias on 

 the Termites, an account of which appeared in the ' Atti dell' 

 Accademia Gioenia di Scienze Xatiu-ali in Catania,' 1893-4, and 

 was translated by Mr. W. F. H. Blandford in 1S97, in the 

 ' Quarterly Journal of Microscopic Science.' Among the Termites 

 under particular circumstances certain individuals are fed on the 

 secretion of the salivary glands of others, and under such con- 

 ditions these individuals, although normally rich in parasitic forms, 

 have been observed to contain none whatever. 



Another fact worthy of note is that although the immatui'e 

 forms of Blatta americana contain a large number of infusorial 

 parasites, in the adults few, if any, are present. I examined the 

 contents of the rectum and the dejecta of Blatta americana, and 

 fouud two forms of cysts present ; one of these I think was the 



Wi 



Fig. 2. 



LrPJ^^,^ 



iia 



.rs 



Possible cjst of Lophomonas sulcata ?, x 800. 



cyst of Gregarina hlattarum. The other (fig. 2) was small and 

 spherical, and contained numerous oval spores. The latter may 

 be the cyst of LopTiomonas sulcata. 



