56 ILLINOIS BIOLOGICAL MONOGRAPHS [56 



Gregarina sp. Wellmer 



1911 Gregarina sp. Wellmer 1911: 146 



There are no data whatever concerning this form. 

 Intestine of Sminthurus fuscus L. 

 Taken in East Prussia. 



LIST OF SPECIES FOUND IN THE ORDER ISOPTERA OF 

 THE CLASS HEXAPODA 



SPECIES OF DOUBTFUL POSITION 



? Gregarina termitis Leidy Termes flavipes; T, lucifugus Rossi. 



Family GREGARINIDAE Labb^ 1899: 9 

 Genus GREGARINA Dufour 1828: 366 

 ? GREGARINA TERMITIS Leidy 

 [Figures 51 and 56] 



1881 Gregarina termitis Leidy 1881: 425 



1897 Gregarina termitis Porter 1897: 65 



1899 Gregarina termitis Labbe 1899: 36 



1903 Gregarina termitis Crawley 1903: 44 



1903 ''Gregarina" termitis Minchin 1903: 337 



1913 Gregarina termitis Ellis 1913: 289 



Sporonts solitary, obese ovoidal. Length 60/i, width 36/i. Ratio 

 LP : TL :: 1 : 3.3 WP : WD :: 1 : 1.2. Protomerite dome-shaped, twice as 

 wide as high, deep constriction at septum. Deutomerite ovoidal, tapering 

 to a rather sharp point. Nucleus spherical, one karyosome. 



Epimerite and cysts unknown. 



Intestine of Termes flavipes; T. lucifugus Rossi. 



Taken at Philadelphia, Pa., Cambridge, Mass., and Boulder, Colo. 



Leidy found but one gregarine in his host, but Porter reports the 

 parasites "very common in some hosts," in the anterior part of the small 

 intestine only. Porter illustrates a section of the intestine in which are 

 "great numbers of cysts." The sections, however, are undoubtedly those 

 of adult sporonts cut crosswise and obliquely, with dark-staining nuclei 

 often sectioned, as often not. A figure (Fig. 74, PI. VI, of Porter) showing 

 an adult solitary sporont in which the protoplasmic granules are fairly 

 large and regularly spherical is described as "that of one filled with sporo- 

 cysts." Porter's figure of a sporont is almost identical with that of Leidy 

 (Plate 52, fig. 27). 



Crawley opened "perhaps a dozen termites" in search for the parasite 

 but did not encounter it. 



I have examined many termites at difiFerent seasons. They were 

 abundantly parasitised with Infusoria (Leidy 1881, and Kofoid and Swezey 

 1919) but no gregarines were recovered. 



