84 c Canadian Arctic Expedition, 1913-18 
longer bristles on posterior margins of segments; hypopygium of moderate size, 
subglobose. Legs with a few bristles but with numerous short setulose hairs; 
fore femora with long bristles on postero-dorsal and postero-ventral surfaces; 
mid femur with at least one moderately strong l^ristle on anterior surface at 
middle; mid and hind tibiae with preapical dorsal bristle, fore pair not visible. 
Inner cross-vein before extreme apex of first vein and slightly beyond middle 
of discal cell; outer cross-vein straight, at more than half its own length from 
end of fifth; last section of fourth nearly 1-5 as long as preceding section;. costal 
spines very little longer than diameter of costal vein. 
Length, 4 mm. 
Type locality: Nome, Alaska, August 24 and 25, 1916 (F. Johansen). 
PIOPHILIDyE. 
The larvffi of all species of this family known to me feed in carrion, or on 
preserved meats, cheese, etc. I have found some species in nvmibers on dead 
animals, especially on the seashore and on the banks of rivers. There is onl}^ 
one specimen in the present collection, which is herein described as new, 
Piophila borealis, n. sp. 
Male. — Glossy black. 
Head black, interfrontalia, lower part of orbits, face, cheeks, and palpi 
reddish yellow. Thorax black, humeri, lateral portions of scutellum, and 
posterior lateral angles of mesonotum translucent red; propleura grey pruinose. 
Abdomen black. Legs black, trochanters, extreme apices of femora, bases 
(broadly) and apices (narrowly) of all tibiae, basal four joints of mid, and three 
joints of hind, tarsi reddish yellow. Wings clear, veins yellow. Halteres 
yellow. 
Frons plain, with weak setulae proximad of triangle; anterior orbital bristle 
very small; central postvertical pair of bristles twice as long and strong as 
laterals; vibrissa strong; cheek almost as high as eye. Thorax smooth, rather 
densely covered with short dark hairs; scutellum subtriangular, convex in centre 
of disc; apical bristles distinctly longer than laterals; propleural bristles of 
moderate length. Abdomen broad, the surface granulose and armed with 
rather closely placed short setulose hairs; hypopygium small. Legs normal 
both in strength and armature. Liner cross-vein slightl}^ beyond apex of first; 
sections of fourth vein 6:5:7 from base to apex. 
Length, 3 mm. 
Type locality: West of Konganevik, Camden bay, Alaska, July 4, 1914 
(F. Johansen). 
This species differs in the colour of the humeri and scutellum from any 
described in the i-ecent paper on the family by Melander and Spuleri. 
EPHYDRID^. 
The members of this family are found in the vicinity of water, the larvae 
being almost without exception aquatic. * 
There is only one species in this collection. 
Scatella brunnipennis Alalloch. 
I described this species in the paper on Pribilof Island Diptera prc^viously 
refei'i'cd to, but which has not yet appeared in print. 
Localities: Demarcation point, Alaska, and Collinson ])oint, Alaska, May 
16, and June 20, 1914; CoUinson point, Alaska, Sei)tenil)er, 22, 1918; Bernard 
harbour, Noithwest Territories, July, 1915 (F. Johansen). 
..i;Bull. 143 Wash. Agr. Exi)(>r. Station, 1917. 
