1910] Reviews 171 
these become more thoroughly explored. Nearly 500 forms are included 
with full synonymic references and also an extensive series of ethological 
references. Useful innovations are the citation of the present location of 
all types, so far as this could be ascertained; the mention of both actual 
places of capture of species and their zonal distribution; and the listing 
in a separate series of all fossil species. Matters of nomenclature have 
been dealt with by a conservative application of the International Zo- 
ological Code. Co Bruns: 
Hewitt, C. Gordon. The House Fly; A Study of Its Structure, Develop- 
ment, Biconomics and Economy. pp. ix, 195; pls. 10. Manchester, 
1910. Sherratt and Hughes. 
Doctor Hewitt has put together in the present book his three valuable 
papers on the house fly, which appeared in the Quarterly Journal of Micro- 
scopical Science during 1907, 1908 and 1909, and has added several short 
appendices dealing mainly with matters of practical importance. The ap- 
pearance of this book just at present is very timely, when general inter- 
est is awakening in the economic importance of the house fly and it is 
to be hoped that Doctor Hewitt’s fine work may find many appreciative 
readers. C. T. Brves. 
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