96 ILLINOIS BIOLOGICAL MONOGRAPHS [306 



GREGAEINA OBLONGA Dufour 

 [Figures 177, 178] 



The only description extant is the original one of Dufour, which 

 is as follows : 



"Oblonga flavescens conico-cylindroidea ; cephalothorace abdominis quintam 

 partem vix adeaquante. 



Hab — Oedipodae migratoriae et Grylli campestris. 



Beaucoup moins conique la G. conique elle a une couleur jaunatre qui ne 

 s'observe pas dans les autres especes." 



Here, as in the case of Gregarina conica, Dufour confused more than 

 one species under a single name. Oedipoda is a genus of the order Dip- 

 tera and also of the Orthoptera. If the Dipteran order is meant, the 

 same species of gregarine would not be looked for in both Diptera and 

 Orthoptera. Such an instance has not yet been recorded for a single 

 species, 



Dufour 's drawings from both insects are, however, similar and are 

 reproduced in my Figures 177 and 178, although the protomerites are 

 slightly different in their relation to the deutomerites.* 



Frantzius lists the species as from Oedipda only. He places it in 

 the same genus Gregarina "stets zu zwei aneinander geheftet." 



Diesing mentions it with hosts as Oedipoda migratoria and 0. stri- 

 dula, and from Gryllus campestris. 



Lankester gives the host as Gryllus. After this mention, the spe- 

 cies passes out of the literature. I have listed it among the parasites of 

 the genus Gregarina because Dufour states 



"cephalothorace abdominis quintam partem" 



and because Frantzius lists it among the parasites with both primite and 

 satellite. 



This species may be identical with Gregarina macorcephala Schn. 

 from the identity of one of the hosts, but the two cannot be correlated. 

 Dufour describes only sporonts and Schneider only cephalonts and un- 



*I have not attempted to separate the parasite in the two hosts as two species 

 from the meager description we have, but have recorded this species in this chapter 

 as well as in Part III, a list of Polycystid Gregarines, under the Diptera. 



