l^O"-] XATUHAL SCIENCES OF PHILADELPHIA. 221 



of the sporodiicts is ])lainly indicated liy the appearance around the 

 periphery of the cyst of dense discoid masses. These are yellowish 

 in color, owin^- to the presence of oil. Time required for maturation, 

 1-4 days. 



.Spores.— Cylindrical, with rounded ends to dolifirm. Dimensions, 

 4.5 by 2.25 microns. 



Host. — Gn/Uus abbrcviatus Serv. 



Locality.— ]^each Haven, New Jersey, and Wyncote, Pennsylvania. 

 Stenophora erratioa sp. n. (PL XVIII, flg. 5.) 



Grcgarina achetoe ahhreviatw Leidy (1853), p. 238, pi. 11, fig. 33. 

 Gregarina achetce abbreviatoe Crawlej^ (1903), p. 45, pi. 3, fig. 34. 



The general form of this gregarine is shown in fig. 5, which was 

 drawn from a young individual, 150 microns long. In the older 

 animals, while the protomerite is much as here shown, although at 

 times relatively shorter, the deutomerite varies considerably in shape. 

 In some its outline is an elongated ellipse, while in others it is broadest 

 near the posterior end, tapering slowl}^ and gradually forward to the 

 septum. The largest animal seen was 500 microns long. 



The epicyte shows distinctly a double contour, and is 1.5 microns 

 thick. The sarcocyte is present all over the animal, and reaches a 

 thickness of 2.5 microns. At the anterior tip of the protomerite, the 

 ectosarc is often thickened to form a low papilla, wathin which are 

 traces of a pore. It is this character which led me to place the gre- 

 garine in the genus Stenophora. The entocyte is dense, except in the 

 anterior third of the protomerite, where it is almost free of granules. 



These gregarines are not at all polymorphic, but almost constantly 

 display the progressive movement. They are by no means infrequent 

 in crickets, but always present in small numbers. The suggestion is 

 permissible that this form is actually the common Stenophora julipusiUi 

 Leidy, somewhat altered in appearance from being in the wrong host. 

 Crickets and Julida? frequently occur in the same environment, and the 

 former might readily swallow spores derived from the feces of the 

 latter. This done, the spores might readily develop, although pro- 

 ducing slightly atypical gregarines. There is an excellent field here 

 for experimental work. 



In addition to the two forms considered above, the cricket harbors 

 a third, a true Gregarina, which is herewith described. 

 Gregarina kingi' sp. n. (PL XVIII, ligs. 10-12.) 



Protomerite. — In the primites, the protomerite, as seen in fig. 10, 



' To Dr. H. D. King. 



