307] STUDIES ON GREGARINES— WATSON 97 



til the cephalonts of the former or the sporonts of the latter or both will 

 have been described, the two species must remain separate. 



The only other parasite described from a host belonging to the sub- 

 family Oedipodinae (Acrididae) is Gregarina locustae Lankester, but 

 the sporonts of the two species are not identical. 



The second host named is now known as Nemohius sylvestris (F.). 



GREGARINA HYALOCEPHALA Dufour 



[Figures 181, 182] 

 1837 Gregarina hyalocephala 

 1851 Gregarina hyalocephala 

 1863 Gregarina hyalocephala 

 1899 Gregarina hyalocephala 



Dufour 's description is as follows: 



"Oblongo-conica ; cephalothorace hemispherico diaphano, abdominis quartam 

 partem subadaequante . Hab. in ventriculo Tridactyli." 



The species is, from this description, and from the character of the 

 epimerite (Figure 182) quite evidently a member of the genus Grega- 

 rina. 



Frantzius does not mention the species; Diesing and Lankester 

 merely do so and Labbe places it among his Uncertain Species. 



GREGARINA OVATA Dufour 



1826 Gregarina ovata 



1837 Gregarina ovata 



1837 Gregarina ovata 



1838 Clepsidrina conoidea 

 1845 Gregarina ovata 

 1848 Gregarina ovata 

 1851 Gregarina ovata 

 1863 Gregarina ovata 

 1873 Clepsidrina ovata 

 1885 Clepsidrina ovata 

 1875 Clepsidrina ovata 

 1899 Gregarina ovata 



1904 Gregarina ovata 



1905 Clepsidrina ovata 



Gregarina: Sporonts biassociative. Measurements not given in 

 any description. Ratio length protomerite : :total length primite :: 



