BIOTIC ASSOCIATIONS OF COCKROACHES — ROTH & WILLIS 183 



Gregarina illinensis M. E. Watson 



Natural host. — Parcohlatta pensylvanica, U.S.A., Illinois (Watson, 

 191 5, 1 91 6) : The intestine of one cockroach was found to contain 25 

 of these gregarines. 



Gregarina impetuosa Harrison 



Natural host. — Melanosilpha capensis, South Africa (Harrison, 

 1955) : All specimens of this gregarine were found in the anterior 

 mesenteron of the host. 



Gregarina l^geri Pinto 



Natural host. — Periplaneta americana, Brazil (Pinto, 1918, 

 1918a, 1919) : Intestinal canal. 



Gregarina neo-brasiliensis Al. Cunha 



Natural host. — Periplaneta americana, Brazil (R. de Almeida 

 Cunha in Pinto, 1919; Cunha, 1919). 



Gregarina ohioensis Semans 



Natural host. — Parcohlatta virginica, U.S.A., Ohio (Semans, 

 1939) : The protozoan was present in large numbers in the insect's 

 midgut. 



Gregarina panchlorae Frenzel 



Natural host. — Panchlora exoleta, Argentina (Frenzel, 1892) : 

 Midgut. 



Gregarina parcoblattae Semans 



Natural hosts. — Parcohlatta pensylvanica and Parcohlatta uhle- 

 riana, U.S.A., Ohio (Semans, 1939) : Midgut. 



Gregarina rhyparobiae J. M. Watson 



Natural host. — Lciicophaca maderae, Uganda (Watson, 1945) : 

 Midgut. Trophozoites could be seen in sections attached to cells of the 

 intestinal wall (fig. 2, H). 



Gregarina sandoni Harrison 



Natural host. — Melanosilpha capensis, South Africa (Harrison, 

 1955) • This gregarine was found in the anterior and middle parts of 

 the mesenteron and in the hepatic caeca. 



