92 E. H. STRICKLAND 
the larvae of 8. bracteatum, which was the only species present 
in those parts of the streams where it occurred. Its life history 
has not received careful attention, but it is evident that it is 
fatal to its host, and it produces if anything more ‘spores’ than 
do the Microsporidia. This parasite, therefore, deserves care- 
ful study, for though it was found only in one species of Simulium, 
this was probably due to the fact that no other species was pres- 
ent where it occurred. 
It is hoped that economic entomologists will, in future, look 
for the presence of these various parasites. If it is then found 
that those districts in which Simulium is not a serious pest, owe 
their deliverance to the presence of these parasites, experiments 
can be undertaken to prove whether the latter can be artificially 
propagated. If this be feasible, and the writer sees no reason to 
doubt it, there is a prospect that in those districts where black 
flies are most numerous, the diseases would spread with great 
rapidity and considerably reduce the devastations and annoyance 
caused by these little Diptera. . ° 
BIBLIOGRAPHY 
BaALBIANI, G. 1863 Sur l’organisation et la nature des psorospermies. C. R. 
Acad. Sci., Paris. tome 57, pp. 157-161. 
Bitscuitr 1862 Bronn’s Klassen und Ordnungen des Thierreichs wissen- 
chafthch dargestellt. Bd. 1, p. 610. 
CrphpE, C. 1907 <A propos de la déhiscence des spores des Myxosporidies. C. 
R. Soc. Biol., 1907, Pt. 1, pp. 185-137. 
DoFLEIN 1898 emdien zur Naturgeschichte der eaooaece III, Uber Myxo- 
osporidien. Zool. Jahrb. (Anat.) Bd. 11. 
Forsss, S. A. 1912 On Black-flies and Buffalo-gnats (Simulium) as possible 
carriers of Pellagra in Illinois. 27th rep. State Entomologist of Illinois. 
VAN GEHUCHTEN, A. 1890 Recherches histologiques sur l’appareil digestif de 
la larve de la Ptychoptera contaminata. La Cellule, tome 6, p. 185. 
Grinsperc, K. 1907 Die blutsaugenden Dipteren. Gustav Fischer; Berlin. 
Guriey, R. R. 1893 On the classification of the Myxosporidia. Bull eee 
Fish Comm. for 1891, vol. 11, p. 407-420. 
1894 The ineporidia or psorosperms of fishes and the epidemics 
produced by them. Rep. U. 8. Commissioner of Fish and Fisheries 
for 1892, pp. 65-304, pl. 1-47. 
HENNEGUY AND THELOHAN 1892 Myxosporidiens parasites des muscles chez 
quelques Crustacés decapodes. Ann. Micrograph., Paris, tome 4, pp. 
617-639. 
