RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 225 



The species is pretty constantly found in the pro-ventriculus of 

 Nydobates pennsylvanicus. 



Another interesting Gregarina is frequent in a common myriapod 

 of our forests, the Scolopoayptops scxsphiosus. It resembles the forms 

 described by Kolliker as G. Sicboldii and by Siebold as G. oligacantha . 

 referred by Stein to Stylorhynchiis, and b}^ Schneider to //f>?;>/(?r//;//zf>^7/.s-. 

 These are common in Europe in the larva of a dragon-fly, Callopteryx 

 Virgo. The species under consideration I propose to name Gregarina 

 actinotiis. The body is elongated conical, thickest and rounded in 

 advance and acute behind. The cephalic division is depressed sphe- 

 roid and broader than long, and is surmounted by a long vase-like 

 rostrum expanding at the top in a horizontal wheel-like disk divided 

 at the border into short digitiform rays. lycngth from 0.06 to 0.52 

 mm.; breadth to 0.08 mm. ; rostrumo.08 too. i mm. long. (Drawing.) 



The accompanying figure represents the para.site. It is commonly 

 found in considerable numbers, adherent by the rostrum to the inner 

 surface of the proventriculus, looking like minute Echinorhynchi. 



After finding the ctirious Gregarine of Sco/opocryptops, one morning 

 subsequently I found a fine Cert}iatia forceps in my bed-room. In it 

 was another species which may be named Gregariiia niegacephala. 

 The body is elongated ovate and acute or short clavate and obtuse 

 with an unusually large ovoid and often constricted head, sur- 

 mounted by a small rounded or elongated appendage. Length 0.42 

 to 0.75 mm. to 0.24 broad ; head about one-fourth the length of the 

 body. It approximates Dufonria agilis of Schneider, found in the 

 larva of a Hydracantharis. 



In some little green beetles, Hoplocephala bicornis, one of the Tene- 

 brionidse, I found a number of gregarines remarkable for the small 

 size of the head and hence the species may be named Gregarina tni^ 

 croaphala. The body is clavate ; the head like a watch crystal with 

 a little ball at the summit. Length 0.35 mm. by o. i wide : head 

 0.012 long by 0.04 wide. 



It bears a close resemblance to Echitioccpha/us /u'spidus of Schneider, 

 found in Lithobius fonipahis, but in the one described I at no time 

 found digitiform appendages to the head. 



[No. 599. See Bibliography.] 



[Gregarina. Dr. Eeidy's unpublished manuscript upon the poly- 

 cystid gregarines of the United States, which manuscript is in the 

 possession of the Academy of Natural Sciences. Philadelphia, has 

 been incorporated in an article b}' Crawley.* 



*I.ist of Polycystid Gregarines of the United States, H. Crawley, Proceed. 

 Acad. Nat. Sci., Phila., 1903, p. 41. 

 t5 



