44 PROCEEDINGS OF THE ACADEMY OF [Jan. 



cases, whereas S. juli was present in hundreds in one case and in only 

 small numbers in the other two. 



Echinomera hispida, the primary parasite of Lithohius forcipatus, was 

 found only four times in thirteen hosts collected at Wyncote and Ral- 

 eigh. In two of these cases, moreover, but a single gregarine was 

 found. At Cambridge, Mass., where Lithobius is a much commoner 

 animal, a larger percentage are parasitized and the gregarines are 

 present in larger numbers. Actinocephalus dujardini, the secondary 

 parasite of Lithohius, is very rare. 



Scolopocryptops is parasitized by Hoplorhynchiis actinotus . The greg- 

 arines occur in small numbers, from ten to twelve, in fifty per cent, of 

 the Chilopods. 



Of the five specimens of Scutigera forceps, four contained gregarines 

 The species is Trichorhynchus pidcher; and never but a very few, from 

 three to ten, are present. 



It is not necessary to go over the balance of the list in detail. Atten- 

 tion may, however, be called to the fact that eight individuals of Geophi- 

 lus were opened in vain. 



III. 



Gregarina blattarum Sieb. 



Gregarina blattarum Siebold (1839), p. 57, Taf. 3, figs. 57-61. 

 Gregarina blattarum Frantzius (1S48), p. 190, Taf. 7, fig. iii. 

 Gregarina blattarum Stein (1848), p. 182, Taf. 9, figs. 38, 39. 

 Gregarina blattce-orientalis Leidy (1853), p. 239, PI. 11, figs. 39-41. 

 Clepsidrina blattarum Schneider (1875), p. 580, PL 17, figs. 11, 12. 

 Clepsidrina blattarum. Btitschli (1881), p. 384, Taf. 20, 21 

 Clepsidrina blattarum Wolters (1891), p. 115, Taf. 7. 

 Clepsidrina blattarum Marshall (1893), p. 25, Taf. 20, 21. 



Common in Periplaneta orientalis, Periplaneta americana and Ectohia 

 (Blatta) germanica. A few specimens of Ischnoptera pennsylvanicus , 

 the field cockroach, were examined, but none contained gregarines. 



? Gregarina termitis Leidy. 



Gregarina termitis Leidy (1881), p. 441, fig. 27. 

 Gregarina termitis Porter (1897), p. 65, PI. 6, figs. 73-76. 



Leidy says : "A small gregarine was once noticed in our Termite, and 

 is represented in fig. 27. The body is ovoid, with the narrower end pos- 

 terior. The head [protomerite] spheroid, compressed from above down- 

 ward. Length .06 mm. ; head .018 mm, long, .03 broad; body .036 mm . 

 broad." 



Porter adds the information that the gregarines are very common in 

 some specimens of termites, occurring mostly in the anterior part of the 

 small intestine, and that the nucleus contains one karyosome. 



