PARASITES OF SIMULIUM LARVAE fai 
from the spore and it is then seen that its base is considerably 
swollen to a knob-like structure (fig. 25). 
The host of Glugea bracteata is the larva of Simulium brac- 
teatum and Simulium hirtipes (?).. It infects about 10 per cent 
of the larvae. I have found this parasite only in the Arnold 
Arboretum, at Forest Hills, Massachusetts. 
From the short descriptions of [Nosema] Glugea simulii by 
Lutz and Splendore (’04 and ’08) it would seem that Glugea 
bracteata is closely related to the octosporic varieties of this spec- 
ies. Although it is stated that the size and shape of the spores 
of this form are very variable, the one figured (’08) is almost 
identical in shape with those found in G. bracteata, with the 
exception of the filament which, according to the text, is some 
six times as long as that of the latter species. In a figure of an 
octosporic pansporoblast, also, it would appear that the panspor- 
oblast membrane is subpersistent, although no statement to this 
effect is given in the text. * From the descriptions of the polysporic 
varieties, which were not figured, it is evident that, if these all 
represent the spores of the same species, it must be extremely 
polymorphic, for the extremes of variation in this species alone 
have heretofore been considered to be of generic value. Should 
further study prove conclusively that this is the case several of 
our now accepted genera will have to be placed in synonomy. 
GLUGEA FIBRATA SP. NOV.: (Plate 3) 
Macroscopic appearance. In later stages this parasite 1s pres- 
ent in the body cavity of its host as several large irregular milk 
white masses, which, as a rule, spread through the entire body 
though they are most voluminous in the swollen apex of the 
abdomen (pl. 3, fig. 1). 
Microscopic structure. If a portion of one of these white masses 
be placed in a drop of water under the high power of a micro- 
scope it will be seen to consist of several different bodies, the 
most abundant of which, in later stages, are small oval spores. 
These spores are all separate and for the greater part nearly 
uniform in size, measuring about 5.8 to 6.6 x 3.5u. Occasion- 
ally however one can find a much larger spore measuring 9 to 
