56 ILLINOIS BIOLOGICAL MONOGRAPHS [266 



Schneider (1875:584-5) described a species as Stenocephalus juli 

 from the intestine of Jnlus sahulosus and what he regarded as Julus ter- 

 restris*. He considered his species as related if not synonymous with 

 a species described by Leidy in 1853 as Gregarina juli marginati. His 

 words are these : 



"Cette espece est commune et me parait etre identique a celle decrite par 

 Leidy sous le nom de Gregarina juli marginati. Dans ce cas, elle serait probable- 

 ment repandue chez les differentes especes du genre Julus, puisqui'on la con- 

 naitrait deja chez trois d'entre elles . . . L' espece est legerment polymorphe ; 

 elle est tantot tres-allongee et relativement etroite, tantot remarquablement mass- 

 ive; mais soij protomerite demeure toujours identique a lui-meme et scuffit ample- 

 ment au diagnostic." 



Schneider overlooked the color factor in correlating the two species. 

 Leidy described his O. juli marginati as "opaque, white." Schneider's 

 Stenocephalus juli has the endocyte colored yellow or orange. Schneider 

 gives no dimensions, but from the figure the proportions of his species 

 agree perfectly with those of Leidy 's species. The protomerites of the 

 two species are slightly different in shape in the character of the papilla 

 at the apex. The papilla in Leidy 's species is large and flattened and the 

 apparent pore is widest at the apex, narrowing as it approaches the en- 

 docyte; in Schneider's figure the papilla is smaller, more conical, either 

 sharp or blunt at the end, slender in the middle, broadening at the base 

 next the endocyte. 



While the two species are obviously closely related, I am of the opin- 

 ion that they are not identical. Crawley (1903a :634) says "the classic 

 Stenophora juli apparently does not occur" in the United States and to 

 date, 1915, it has not been described from this country. 



If Schneider had given a set of dimensions for his species, that were 

 identical Avith those of Leidy, the personal equation might have been con- 

 sidered to such an extent as to eliminate the color consideration and the 

 variation in the two protomerites. 



Leidy 's Gregarina julu marginati is thus seen to be distinct from 

 Schneider's S. juli and stands today as Stenophora larvata (Leidy) 

 Ellis. 



In 1880, Gabriel (p. 371) mentioned a species which he calls Grega- 

 rina paradoxa and says it is identical with G. juli (Frantz.) Sehn. 

 Neither description nor drawings accompany this statement and the rea- 

 son for giving the species a new name, if it be ^S*. juli, is not apparent. 



*Leger and Duboscq (1904:364) say that /. fallax Mein. (/. albipcs C. Koch) 

 is probably the /. terrestris of Schneider. 



