Diptera 75 c 
Locality: Three male specimens, Nome, Alaska, August 21 and 24, 1916 
(F. Johansen). 
Both these European species are recorded herein for the first time from 
North America. 
FUCELLIN.^. 
Fucellia Robineau-Desvoid}-. 
The species of this genus are found along the margins of streams, on the 
seashore, and on the shores of lakes. 
Fucellia punctipennis Becker. 
Fucellia punclipennis Becker, Middel. om Gronland, vol. 29, p. 411, 1908. 
This species was described from east Greenland and has not since been 
recorded. All the specimens in the present collectioil were obtained at Bernard 
harbour. Dolphin and Union strait, Northwest Territories, May 1916, and June 
18, 1915. Eleven specimens (F. Johansen). 
Fucellia ariciiformis Holmgren, 
Fucellia ariciiformis Holmgren, Kongl. Vetenskap.Forhandl., 1872, No. 6, p. 103. 
This species was originally described from Greenland. I have seen examples 
from Pribilof islands. There are twenty-nine specimens in the present collec- 
tion: nine from Bernard harbour, Dolphin and Union strait. Northwest Terri- 
tories, taken May 19, 1916, May 20 and 22, June 25, and July 11, 1915; nineteen 
from Demarcation point, Alaska, May 15, 1914; and one from Collinson point, 
Alaska, June 20, 1914 (F. Johansen). 
SCATOPHAGID^. 
The larvae of most species of this family feed upon decaying vegetable 
matter and manure. One North American species, Hydromyza. confluens Loew, 
mines, in the larval stage, in the stems of Nymphaea americana. The imagines 
of many species are predaceous, feeding upon other small insects, and most of 
them are found near water, particularly on the shores of rivers, lakes, and on 
the seashore. Many species can be obtained only by very thorough sweeping 
with an insect net over grasses and other herbage growing in ponds and along 
their extreme margins. 
The literature on this family is in deplorable condition from the point of 
view of one who has to identify species, and in order to make clear the generic 
concepts of the writer I have drawn up a key to the genera, which is included 
in this paper. 
Very many species of the family occur in northern latitudes — in fact the 
family is essentially a northern one — and this key will be found useful in future 
work on arctic Diptera. 
Some of the genera are proposed herein for the first time, and several are 
recorded for the first time from this continent. 
Key to Genera. 
1. Species with three sternopleural bristles 2 
Species with two sternopleural bristles 5 
" Species with one sternopleural bristle 7 
2. First wing-vein bristly on apical half; palpi without long apical britsle; arista short- 
haired or pubescent; scutellum with two or four bristles; fore femora without 
closely placed or very strong antero-ventral bristles Orlhochaela Becker. 
First wing-vein bare, or the species does not have all of the above characters 3 
