83 
generic determination made for this species, which was described without 
the cysts. 
Cyst. The opaque lemon yellow cysts taken from the excrement 
of the host were spherical. The cyst proper measured about 300 u while 
the single tough gelatinous envelope varied from 2 u to 10 w in thickness. 
Cysts taken on July 19 on July 21 showed several bright orange spots 
just under the gelatinous envelope. On July 23 these has developed 
into definite sporoduct-buds some 4 u high and 5 u in diameter. In the 
meantime the cyst had become pale gray. The following day dehiscence 
took place. The brilliant orange sporoducts when everted were quite 
short not exceeding 200 u in length. The largest numberseen on a single 
cyst was ten. Some cysts had but seven sporoducts. These were scat- 
tered over the surface of the cyst apparantly without arrangement for 
often two or three would be found quite close together. Cysts taken 
from the alimentary canal of the host were also spherical and differed 
if at all from those collected from the excrement in being a little paler 
in color. In this particular they were unlike the cysts of Gregarina acri- 
diorum (Leger) which according to Wellmert are oval in shape while in 
the intestine although spherical after being discharged. 
Spores. The barrel-shaped spores are discharged in chains which 
do not disintegrate for some time after they leave the sporoduct. The 
individual spores are hyaline but with an easily visible endospore. A 
distinct variation in the shape of the spores was observed, some having 
such well defined angles that whey were hexagonal in profile while 
others were so uniformly rounded that they were almost oval. Size 
5 u by 8 u. 
The dehiscence of the cysts by sporoducts differentiates this species 
from Hirmocystis rigida Hall which is also reported from grasshoppers 
of the genus Melanoplus. 
Gregarina blattarum Siebold. 
Gregarina blattarum Siebold, 67, taf. 3, 1839. 
This gregarine was found in several specimens of the native roach 
Ischnoptera pennsylvanica from the woods near Douglas Lake. The 
large oval cysts were collected from the excrement of individuals in cap- 
tivity during July and when placed in water these cysts dehisced in ten 
days. 
Although no introduced roaches have been collected in the vicinity 
of the Biological Station this gregarine from native roaches seems un- 
doubted the typical @. blattarwm agreeing in spores, cysts and sporonts 
with that species. The biological question of interest is of course the 
4 Schrift. Physik-ökonom. Ges. Königsberg i. Pr., LU, II, p. 113, 1911. 
6* 
