66 E. H. STRICKLAND 
interpretation, which, from the same writer’s modified definition 
of Glugea, debars it from this genus. The early stages are how- 
ever typically Glugeid so that I have provisionally placed the 
species in this genus. I shall discuss this more fully after deserib- 
ing the species. 
During February, 1912, I found a species of Glugea infesting 
the larvae of Simulium sp. in streams around Port of Spain, 
Trinidad, B.W.I. The spore formation in this species was poly- 
sporic in which respect it resembled 8S. multispora, of which a 
description is given further on in this paper. This species was 
not abundant, although I found some half-dozen infected larvae. 
Other parasites which I have found infesting Simulium larvae 
in the neighborhood of Boston are a nemathelminth belonging 
to, or near, the genus Mermis, which, during the spring of 1911, 
parasitised some 25 per cent of the larvae of the streams in which 
it occurred. As pointed out in my former paper (’11) on this 
parasite, its presence is fatal to the host in every case. I have 
since found that the presence of these worms in Simulium lar- 
vae was also mentioned by Lutz (’09) in his work on Brazilian 
species of the genus. 
During the fall of 1911 another parasite was found infesting 
the majority of larvae in certain streams and, as I shall show, 
its presence is evidently fatal to the host. I sent preparations 
of this parasite to Professor Calkins, and he informs me that 
it is probably a species of Gregarine. I have not studied it in 
detail and shall confine my remarks in the sequel to its general 
appearance and its effect on its hast. 
GLUGEA BRACTEATA SP. NOV.: (Plate 2) 
Macroscopic appearance. In later stages this parasite is present 
in the body cavity of its host as a large irregular white mass, 
sometime measuring as much as 2 mm. in length. This mass 
may consist of one very large, or several smaller myxosporidia 
which together only occupy as much space as does the single 
large myxosporidium. It is usually confined to the posterior 
portion of the abdomen, which becomes much distended, owing 
to the large mass of the parasites which is most voluminous 
latero-ventrally to the alimentary canal (pl. 2, fig. 1). 
