Saw-flies 5 g 
punctured than the mesoscutum; mesopleura finely densely punctured and 
setaceous; front wings fully formed, not reaching beyond the seventh abdominal 
segment, the petiolate cell abbreviated, veins and stigma brownish; hind wings 
normal in size and venation; claws deeply cleft, the rays subequal; the abdomen 
finely granular; saw-guides large and broad, the dorsal margin straight, the 
ventral margin oblique, the distal end obliquely and broadly rounded; cerci 
long and slender, extending beyond the e,nd of the abdomen; color black with 
the tegulae and the legs with the knees, tibiae, and tarsi yellowish infuscated. 
Length 4 mm. 
Herschel island, Yukon Territory. F. Johansen, collector. Larvae collected 
in galls on leaves of Salix reticulata L., August 13, 1914. Adults emerged July, 
1915. Specimen No. 253. 
This specimen was received as a part of Breeding Record 36. '' Material 
(galls) only collected (in 1914) once and from- the same host-plant (Salix 
reticulata)." There is the further note on larvae from willows on Herschel island: 
''Host-plant Salix reticulata L. 2 (3) imagines reared. Galls." Mr. Johansen 
makes the further suggestion regarding this number: ''Larvae collected as galls 
on bushy willow, probably Salix Richardsonii K., on Herschel island, Yukon 
Territory, end of July, 1916, were not reared (only in alcohol). Their host- 
plant is different from that of Rearing Record 36." The structure of the wings 
of the adult and the habits of the larvae of the species of Euura, which have 
always been considered as borers in the stem of willow, precludes its inclusion 
with the other specimen received under this breeding record number and 
descril)ed later as Pontania delicatula. I mistrust that the feeding habits of the 
larvae of the species of Euura do not vary but that in bred individuals, the wings 
are not always completely matured, with the result that there are specimens bred 
from galls which lack the free part of R5 and described as species of Euura. 
This species is related to niger Prov. It is readily separated from this species 
by the short wings, the difference in the median fovea and frontal crest and in 
the darker-coloured legs. 
Euura arctica, n. sp. 
Female. — Head coarsely granular throughout; the clypeus broadly, 
deeply, angularly emarginate, the clypeal lobes broad and rounded; the labrum 
broadly rounded and setaceous; the antennal furrows deep and broad from the 
pretentorinae to the frontal crest, indefinite on the cephalic aspect, broad and 
deep adjacent to the lateral ocelli, terminating in a large punctiform depression, 
not reaching the caudal margin of the head; the interocellar furrow a linear 
depression extending from the median ocellus to a linear, low, V-shaped ocellar 
furrow, which is not connected with the antennal furrows; the antennal furrows, 
widened opposite the median ocellus, extending almost to the compound eyes, 
limited on the ventral side by a distinct elevation; the ocellar area convex, not 
elevated above the broad flat ocellar basin; ocellar basin limited on the ventral 
side by strongly elevated frontal areas which are continuous with the frontal 
crest, separated by a broad concavity which is continuous with the long broad 
concave median fovea; median fovea limited by low antennal plates; supraclyp- 
eal area broadly convex; antennae long and slender, the third segment slightly 
longer than the fourth, the surface of the segments granular and finely setaceous; 
the pronotum coarsely granular like the head; the median and lateral lobes of 
the mesonotum uniformly finely granular, the latter sparsely setaceous; the 
median lobe with a broad longitudinal depression with a mesal carina; the 
mesoscutellum and mesopostscutellum polished; the metascutum concealed by 
the wings; the mesopleura with the dorsal portion finely granular and the 
ventral portion, the mesosternum, and the metapleura, pohshed; the front 
wings normal in size, the costa and stigma pale, and the other veins brownish; 
the claws deeply cleft, the inner ray much shorter than the outer; the abdomen 
