6 G Canadian Arctic Expedition, 1913-18 



finely granular; the saw-guides with the dorsal and ventral margins rounded, 

 the distal end bluntly rounded, the distal third and the ventral portion setaceous; 

 the cerci long and pointed; colour black with the following parts infuscated 

 yellowish: the mandibles in part, the tegulae, the knees, and the tibia?, and 

 the tarsi. Length, 10 mm. 



Galls. — The galls, Breeding Record 90, considered as belonging to this 

 species, are small reddish globular ones occurring on the leaves and are similar 

 to those of Pontania and resemble in appearance and shape those of Pontania 

 atrata. The adult has the wing venation typical of the genus Euura. 



"Material (larvae) collected on Salix reticulata both by F. Johansen at 

 Bernard harbour, Northwest Territories, August 16, 1915, in willow catkins; 

 and by R. M. Anderson at Cape Barrow, Northwest Territories, August 14, 

 1915, in galls on willow leaves. Owing to shortness of jars the two collections 

 were placed together when Dr. Anderson gave me his material in October, 1915, 

 and nothing has come out of (dead?) my larvae from August 16, at that time nor 

 later. The material from Bernard harbour (if any) probably belongs to the 

 same species as Breeding Record 85; while Breeding Record 90 properly only 

 refers to the material collected by Dr. Anderson." 



Bernard harbour and Cape Krusenstern, Northwest Territories. F. Johan- 

 sen, collector. July 6, 1916. Specimen No. 295. 



This species can be separated from insularis Kincaid by the form of the 

 median fovea and the frontal crest and the colour of the labrum and legs. 



The seven species of Pontania described on the following pages can be 

 separated by means of the following table: — 



a Head, including orbits, and the collar black. 



b Supraclypeal area with its dorsal extent limited by a distinct crestal furrow atrata. 



bb Supraclypeal area not limited by a distinct crestal furrow. 

 c Tegulae black. 



d Ocellar basin flat lorata. 



dd Ocellar basin deeply furrowed delicatula. 



cc Tegulae pale deminuta. 



aa Head with orbits and pronotum with collar resinous or ferruginous. 



b Mesonotum with the median and lateral lobes black quadrifasciata. 



bb Mesonotum with a large V-shaped resinous or ferruginous mark. 



c Head with postocellar area longitudinally furrowed; frontal crest large and broadly 

 interrupted subpallida. 



cc Head with postocellar area not longitudinally furrowed; frontal crest distinct but 

 not large and narrowly interrupted trifasciata. 



Pontania atrata, n. sp. 



Female. — Head with the surface in great part finely granular; the clypeus 

 short, narrowly roundly emarginate, the clypeal lobes broad and rounded; 

 the supraclypeal area strongly convex, separated from the frontal crest by a deep 

 crestal furrow extending to the antennal furrows; the median fovea large and 

 distinct; the frontal crest large, strongly swollen, interrupted by a broad shallow 

 furrow extending to the crestal furrow; the antennal furrows deep, bounding 

 a strongly elevated frontal area with a large flat or slightly concave ocellar 

 basin extending from the lateral ocelli to the frontal crest; the frontal ridge 

 wanting; vertical furrows punctiform; ocellar and interocellar furrows forming 

 a T-shaped depression, the ocellar furrow not connected with the antennal 

 furrows; the antennas short and flattened, the third and fourth segments sub- 

 equal in length, the fifth slightly shorter; the pronotum and median lobe of 

 the mesonotum finely granular, the lateral lobes with the cephalic portion of 

 each granular and the caudal portion smooth and polished; the mesoscutellum, 

 mesopostscutellum, and metascutum smooth and polished; the mesopleura, the 



