INTRODUCTION. | 
Tus Volume includes the enumeration of the Families Mistride, Muscide, and 
Hippoboscide, the whole of which has been contributed by Van der Wulp, most of the 
material having been collected by Mr. and Mrs. H. H. Smith, in Mexico, in 1888-89. 
Unfortunately, the author did not live long enough to complete his task, the 
Agromyzine, Borborine, Chloropsine, Drosophiline, Ephydrine, Geomyzine, and 
Sapromyzine, of the ‘“‘ Muscide Acalyptere,” the Families Phoride and Nycteribiidee 
(the last-mentioned being unrepresented in our collection), and the Aphaniptera, 
still remaining undone at the time of his death, on November 27th, 1899. The Group » 
Trypetine, of the “ Muscide Acalyptere,” was then in course of publication, and the 
prcoof-sheets were passed by him shortly before his decease. As we have not found an 
Entomologist willing to work out the remainder, it has been considered advisable to 
close the Volume as it stands, the MSS. of the Hippoboscide and of the Supplement to 
the “ Muscide Calyptere,” with the accompanying drawings, having been in our hands 
for three years, and brief diagnoses of the new species of Muscide published in the 
‘Tijdschrift voor Entomologie’ for 1892, pp. 183-195. 
At the end of the Volume is appended a list of the species described since 1888 by 
other authors from Mexico or Central America which have not been noticed by Van 
der Wulp, as well as a list of the various new genera that have been based upon species 
originally described in this work. As regards the numerous “ Muscide Calyptere”’ 
named by Dr. Giglio-Tos, some of them will certainly prove to be synonymous with 
others previously dealt with by Van der Wulp. Altogether, 1095 species are 
enumerated, 585 being described as new, with forty new genera. 
The thirteen coloured Plates have all been prepared by Mr. Wilson, of Cambridge, 
from drawings made by the author, who also drew the figures of the Trypetine 
reproduced in the text (pp. 424-428). 
The Index to the three Volumes of this subject will be inserted at the end of 
Vol. III., when completed. 
Ep. 
May 1903. 
