74 c Canadian Arctic Expedition, 1913-18 
Locality: Bernard harbour, Dolphin and Union strait, Northwest Territories, 
August 1-7, 1915, and July, 1916 (F. Johansen). 
Phorbia, sp. 3. 
One male in very poor condition. Resembles hrevitarsata in armature 
of the legs, but differs in having the abdomen depressed, and the hind tarsi 
about as long as the tibia. 
Locality: On sandy beach, Bernard harbour, Dolphin and L'nion strait. 
Northwest Territories, July 19, 1915 (F. Johansen). 
Phorbia, spp. 
Five specimens belonging to this genus are in such poor condition that 
I cannot satisfactorily assign them to any of the preceding species or to any 
known to me. 
Locality: Herschel island, Yukon Territory, July 29, 1916, one female; 
Bernard harbour. Northwest Territories, July 10, 1915, one male, one female; 
same locality, June 18, 1915, one female; Collinson point, Alaska, June 20, 
1914 (F. Johansen). 
Pegomyia Robineau-Desvoidy. 
This genus as at present constituted contains species which are very dissimilar 
in habitus, and my knowledge of the larval habits of a number of the species 
leads me to consider certain that such species as unicolor Stein, affinis Stein, 
and hicolor Wiedemann are not congeneric. The first-named I have reared 
from mushrooms, and the larva resembles much more closely that of Anthomyia 
pluvialis Linne than that of hicolor, which is a leaf-miner. The larvae of 
affinis are found in burrows of rodents and in caves or holes in the ground which 
mammals or birds frequent and are essentially scavengers; their structure 
is unknown to me. Both species in the present collection are more closely 
related to unicolor than to hicolor and may have the same larval habits. 
Pegomyia flavipes (Fallen.) 
Anthomyia flavipes Fallen. Dipt. Suec, Muse, p. 90, sp. 12.5, 1820. 
Anthomyia pulchripes Loew. Zeitschr. f. Ges. Naturwiss, 104. 1857. 
Pegomyia flavipes (Fallen) Stein, Wien Ent. Zeitg., vol. 25, p. 69, 1906. 
This species has the general habitus of unicolor Stein, but is considerably 
darker in colour and is separable from its congeners by the remarkably long 
bristles on the antero-ventral surface of the hind femora, the longest one being 
at least three times as long as the diameter of the femora where it is situated. 
The lower bristle on the postero-dorsal surface of the hind til)ia is about half 
as long as the tibia. 
One male specimen in verv poor condition, Nome, Alaska, August 21, 
1916 (F. Johansen). 
Pegomyia albimargo Pandell. 
Pegomyia albimargo Pandell, Rev. Ent. France, vol. 20, p. 296, 1901. 
Phorbia obscura Meade (nee Macquart). Ent. Month. Mag., vol. 19, p. 216, 1883. 
This species is one of the smallest and most variable in colour in the group. 
Sometimes the whole insect, including the legs, is l)lack, ])ut common^ the 
abdomen and at least the tibise are reddish, or translucent. The thorax is always 
black and in front is marked with four short vittse, between which the dorsum 
is conspicuously white pruinescent. The black antennae and palpi serve to 
distinguish the species from vittigera Zetterstedt, which it most closely resem- 
bles in the chaetotaxy of the legs. 
