10 



PROCEEDINGS OF THE ACADEMY OF 



[1889. 



Fig. i. 



Gregarina philica. 



40 diam. 





Fig. 2. Fi<;. 3 



Gregarina actinotus. Gregarina mega 

 175 diam. cephala 



Iii the species under consideration I have observed 

 that the pairs conjoin, as represented in the accom- 

 panying figure, with the heads together and the bodies 

 side by side. In numerous instances the position was 

 invariable, and in all, the couples variably differed in 

 size. Thus in one pair the longer individual was L75 

 mm. long; and the smaller one 075 mm. loner, and in 

 another pair the larger individual was 2 mm. long 

 and the other 1'75 mm. 



The species is pretty constantly found in the pro- 

 ventriculus of Nyctobates pennsylvanicus. 



Another interesting Gregarina is frequent in a com- 

 mon myriapod of our forests, the Scolopocryptops sex- 

 spinosus. It resembles the forms described by Kolli- 

 ker as G. Sieboldii and by Siebold as G. oligacantha, 

 referred by Stein to Stylorhynchus, and by Schneider 

 to Hoplorhynchus. These are common in Europe in 

 the larva of a dragon-fly, Callopteryx virgo. The 

 species under consideration I propose to name Gre- 

 garina actinotus. The body is elongated conical, 

 thickest and rounded in advance and acute behind. 

 The cephalic division is depressed spheroid 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. Length from .006 to - 52 mm. ; 

 breadth to 0*08 mm. ; rostrum - 08 to 0"1 mm. long. 

 The accompanying figure represents 

 the parasite. 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 curious Gregarine 

 of Scolopocryptops, one morning sub- 

 sequently I found a fine Cermatia for- 

 ceps in my bed room. In it was another 

 species which may be named Gregarina 

 megacephala. The body is elongated 

 ovate and acute or short clavate and 

 obtuse with an unusually large ovoid 

 and often constricted head, surmounted 

 by a small rounded or elongated ap- 

 pendage. Length 0'42 to 0"75 mm. to 

 - 24 broad ; head about one-fourth the 

 length of the body. It approximates 

 Dufouria agilis of Schneider, found in 

 the larva of a Hydracantharis. 



In some little green beetles, IIoplo- 

 diam. cephala bicornis, one of the Tenebrion- 



