385] STUDIES ON GREGARINES— WATSON 175 



GREGARINA PASSALI Lankester 



[Figure 139] 



1853 Gregarina passali cornuti Leidy 1853 :238 



1863 Gregarina Passali Lankester 1863:94 



1903 Gregarina passali cornuti Crawley 1903 -.45 



1913 Gregarina passali cornuti Ellis 1913a :201 



Gregarina : Sporonts biassociative, cylindrical. Length of associa- 

 tions 350 to 400/x. Width not given. Ratio length protomerite : total 

 length primite : : 1 : 5 ; width protomerite : width deutomerite : : 

 1 : 1. Protomerite dome shaped, flattened, li/^ times as wide as high. 

 Slight constriction at septum. Deutomerite cylindrical, sometimes con- 

 stricted a little in middle. Posterior extremity broadly rounded or flat- 

 tened. Endocyte opaque ; nucleus spherical, content not mentioned. 



Taken at Philadelphia, Pa., and New Orleans, La. Host: Passalus 

 cornutus Fab. Habitat: Intestine. 



Leidy 's figure represents sporonts with the deutomerite much wider 

 than long. Crawley 's figure is normal. Leidy probably left the animals 

 on the slide in a water medium until they had become greatly distended 

 before drawing them. Ellis recovered the same species from the same 

 Lucanid, from Louisiana. 



This species takes the first binomial name, that of Lankester. 



The beetles of this host species at Urbana, Illinois, seem to be unin- 

 fected. Twenty-five or more have been examined without finding an 

 instance of parasitism with gregarines. They are abundantly supplied 

 with nematodes. 



GREGARINA MELOLONTHAE Lankester 



1856 Gregarina Melolonthae Brunneae Leidy 1856 :47 



1863 Gregarina Melolonthae Lankester 1863 :94 



1913 Gregarina melolonthaehrunneae Ellis 1913b :269 



Gregarina: Sporonts biassociative, ellipsoidal. Length of primite 

 400/u,, width 250/A. Ratio length protomerite : total length :: 1 : 4; 

 width protomerite : width .deutomerite :: 1 : 1.7. Protomerite ob- 

 late spheroidal, slightly elevated at summit. Deutomerite oblong ovoi- 

 dal. Taken at Philadelphia, Pa. 



Host: Melolontha brunnea. Habitat: Intestine. 



This species has not been redescribed. No drawings accompany 

 Leidy 's brief record. Lankester shortened the name to a binomial and 

 it is this name by which the species must be designated. Ellis merely 

 mentions the species. 



