2 INTRODUCTION. 
A special feature of the Region is the richness and variety of 
the genera Asarcina, Graptomyza, Syritta, and Eumerus ; there 
are also many peculiar forms of Microdon. But the most prominent 
character is to be found in the great development of the forms 
of the Hristalis-group. The genus Protylocera is exclusively 
Ethiopian*, and the genera Phytomia (Megaspis), Simotdes, Lathy- 
rophthalmus, and Eristalodes are very rich in characteristic species. 
The genus Helophilus is almost entirely restricted to the subgenera 
Mesembrius and Prionotomyia. 
In the following pages descriptions of the new genera and new 
species are given, together with tables of all the genera and species 
represented in the collection and remarks on the previously described 
forms. 
I have to thank Mr. Guy A. K. Marshall, the Director of the 
Imperial Bureau of Entomology, for having placed at my disposal 
such an important collection of Ethiopian Syrphidz, which is 
without any doubt the most extensive yet brought together. 
* The South-American Eristalis nigripennis, Macquart, which, according 
to Dr. Speiser (Jahrbiich, d. Nassauisch. Ver. f. Naturk. i. Wiesbaden, Ixvi. 
1913, p. 122), belongs to Protylocera, is really a true Hristalis. 

