12 G Canadian Arctic Expedition, 1913-18 
antennae slender, the third segment shorter than either the fourth or fifth, the 
fifth shorter than the fourth, the surface finely punctured and setaceous; the pro- 
notum and the median and lateral lobes of the mesonotum finely densely granular; 
the mesoscutellum and mesopostscutellum polished; the mesopleura finely 
densely granular, the mesosternum and metapleura polished; the wings hyaline, 
the veins and stigma pale; the claws deeply cleft, the inner ray nearly as long as 
the outer; the abdomen faintly granular, polished; the saw-guides broad and 
stout, the dorsal margin straight, the ventral margin broadly convex, the con- 
vexity continued to the dorsal margin, forming an oblique bluntly pointed distal 
end, the distal end and the ventral margin setaceous; color black with the 
following parts yellowish: the posterior and outer orbits, the collar broadly, 
the tegulse, a broad V-shaped band covering the parapsidial furrows, the cephalic 
half of the mesopostscutellum and continuous with a similar spot on each axila, 
a large triangular spot on the mesopleura, the legs except the trochanters in 
part and the proximal portion of the caudal surface of the femora more or less 
and the tarsi, the ventral aspect of the abdomen, the saw-guides, and the two 
caudal terga. Length, 6 mm. 
Bernard harbour, Northwest Territories, Julv 15, 1915. Specimen No. 
1253. 
This species resembles potmim Walsh. The punctured head, the shallow 
emargination of the clypeus, and the general topography of the head will serve 
to differentiate it. 
The collection contained specimens of the galls of the following from which 
no adults were secured: — 
Breeding Record: The larvge described below were collected on bushy 
willow (Salix Richardsonii) on Herschel island, end of July, 1916. The portions 
of the plant enclosed with the larvae in alcohol were the ends of the branches 
bearing the seed pods and in each case had been mined by a larva. This was 
considered at first as an indication that it was a species of Euura. It may be 
this or it may be the larva of a species of Pontania that has completed its feeding 
and has left its gall and is boring into the seed pod to make a place for pupation. 
Larva. — Body white, shading to brownish, with a portion of the head 
and the articulations of the segments of the legs brownish; ocularium round and 
black, the ocellus situated in its center; antennae convex oval area near the 
ventral margin of the ocularia, limited l)y a brownish line and its surface bearing 
eight minute brownish areas; head white with minute, round, inconspicuous 
spots on the dorsal half, forming a fuscous spot on the dorsal half of the front; 
mandibles distinctly dentate; spinneret prominent, the distal end bluntly 
rounded; microthorax linear, white; thorax and abdomen with some of the 
annulets swollen and the summit of the swollen area slightly fuscous and with 
minute uncoloured spots bearing setae; prothorax with three annulets, the first 
and third inconspicuous, the second bearing three setae on each side of the 
meson, the spiracular area large and swollen and bearing two setae, the pedal 
area swollen and indistinctly separated from the spiracular area; mesothorax 
and metathorax with four annulets, the first short and swollen, the second and 
third subequal in length, the mesal portion of the second slightly depressed, 
the mesal portion of the third swollen and separated from each lateral portion, 
the lateral portions of the second annulet bearing two setae and of the third 
three setae, the spiracular areas large and each bearing about three inconspicuous 
setae, the pedal areas distinctly marked and swollen, setae inconspicuous; 
abdominal segments one to eight with four annulets, the first small, the second 
and third large and swollen and with distinctly elevated lighter coloured mesal 
creeping ridges, the lateral portions of each bearing about two setae; spiracular 
areas swollen and bearing about two setae and distinctly separated from the 
swollen pedal areas bearing two or three setae; annulets indistinct on the ninth 
and tenth segments; setae of the tenth segment fairly numerous and without 
definite arrangement; prolegs long, cylindrical, and typical in form; spiracles 
