58 ILLINOIS BIOLOGICAL MONOGRAPHS [58 



1811 Vibrio Reduvii 

 1848 Sporadina Reduvii 

 1848 Sporadina Reduvii 

 1859 Gregarina Reduvii 

 1863 Gregarina Reduvii 

 1899 Hyalospora reduvii 

 1903 Hyalospora reduvii 



Taken at Berlin. 



Intestine of Reduvius personatus (L.). 



Ramdohr placed the species with the Infusoria, in the genus Vibrio. 



Stein gives these dimensions: 

 Sie zeigten sehr verschiedene Grosse, die grossten waren etwa /^ ' ' ' lang und 1/38 ' ' ' breit 



He also observed cysts in which two sporonts were united. Nine spore- 

 ducts were seen, with spore extrusion in chains. The spores were 

 . , kung spindelformig oder fast eiformig , 1/250'" by 1/570'". 



His illustrations show them to be well-rounded at the ends. 



The genus Hyalospora, in which the specimens recorded were placed 

 by Labbe, is characterized in part by (a) sporonts in associations of two, 

 (b) cysts with simple rupture, (c) spores fusiform, sharply pointed at the 

 ends. 



The species in question does not belong in this genus because (a) among 

 the great numbers of parasites seen by Stein none is mentioned as found 

 in association and his figure indicates a solitary individual, (b) cyst dehis- 

 cence is accomplished through spore-ducts (nine in the figure of Stein), 

 and (c) with spores extruded in chains. The spores are ellipsoidal, rounded 

 at the ends. 



It is evident that the species belongs in the family Gregarinidae from 

 the method of cyst dehiscence. I have placed it with the Uncertain 

 Species because of insufiicient data. It seems to most closely resemble 

 the genus Leidyana Watson. 



