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Hippoboscidae (.Diptera Pupipara) 
Figures. 
Very few illustrations have been employed in describing members of this 
family and such as have been given have usually been of but little value to 
the systematise In fact the majority of the existing figures can only be des¬ 
cribed as crude. A most gratifying exception to this rule is that of the figures 
given by Massonat (1909) in an extended paper on the family. Yet even these 
figures, although they are probably the best that have been given by any 
author, are not as detailed and careful as is desirable, too little attention having 
been given, for instance, to the chaetotaxy, which in some genera is a matter 
of considerable importance. 
The figures that we are presenting have for the most part been made from 
carefully corrected camera lucida sketches. We have endeavoured to put into 
them all the structures visible in the specimens, but this ideal cannot entirely 
be realized, it being impossible to show some of the pleural structures of the 
thorax. We have endeavoured also to attain a degree of accuracy that will 
at least come within the probable range of variation. All the figures have been 
checked over by both authors. 
In the case of figures that are divided, the left half represents the dorsal 
aspect, the right half the ventral aspect. We believe that the many advantages 
of this type of figure far outweigh any possible disadvantages and are sufficient 
to overcome any possible objections on the ground that the figures are not 
artistic. 
Acknowledgments. 
The material upon which this paper is based has come from various sources. 
We are especially indebted to Mr E. P. Van Duzee, Curator of Entomology 
of the California Academy of Sciences, for placing at our disposal the Hxppo- 
boscidae in the collection of that institution. The Department of Entomology 
of the University of California, through Prof. S. B. Freeborn, has loaned 
material of the genus Lipoptena. Certain specimens were taken some years 
ago by the senior author from skins in the collections of the United States 
National Museum and the Field Columbian Museum and acknowledgments 
are due to the authorities of these institutions for this privilege. Finally, to 
Major E. E. Austen, of the British Museum, we are indebted for specimens of 
Lipoptena cervi and Ornithomyia lagopodis. 
% 
Genus Lipoptena Nitzsch. 
The material of this genus that is before us represents five species, one of 
which is apparently new. In addition to notes on specific characters we are 
enabled to add also some information concerning the larvae. 
Specific characters. 
It appears from our material that excellent specific characters are to be 
found in the genitalia of the males, which can be seen to advantage only in 
