ICHNEUMON-FLIES, PART 2: EPHIALTXNAE 51 



213 on Kichardson Highway, Mount McKinley at 1,600 and 1,700 ft., 

 Nome, St. Paul Island, Shaw Creek at Mile 289 on Richardson High- 

 way, and Summit Lake in Isabella Pass); Alberta (Blackfoot Hills); 

 Arizona (near Alpine); British Columbia (Clinton, Diamond Head 

 Trail at 3,200 ft. in Garibaldi Park, "Hatchery Arm," Likely, and 

 Robson); California (Berkeley, Dardanelle, Donner Pass, Hope Valley 

 in Alpine Co., Leevining, Moraga Valley in Contra Costa County, 

 Oakland, and San Francisco); Colorado (Cameron Pass, Pingree Park 

 in Larimer Co., and Walden); Manitoba (Birtle, Churchill, and 

 Winnipeg); Minnesota (St. Paul); Northwest Territories (Cameron 

 Bay on Great Bear Lake, Chesterfield, Norman Wells, "Sawmill 

 Bay," and Yellowknife) ; Ontario (Bowmanville and Ottawa); Quebec 

 (Great Whale River, Joliette, and Parke Reserve in Kamouraska Co.); 

 Saskatchewan (Snowden and Waskesiu Lake); Washington (Belling- 

 ham, Blewitt, Mount Rainier at 4,700 and 5,000 ft., and Wiser Lake 

 in Whatcom Co.); Yukon Territory (Haines Junction, Marsh Lake, 

 Rampart House, Rancheria-Swift River, and Whitehorse). 



Hosts: The subspecies has frequently been associated with Salix 

 and with sawfly galls thereon. The type was reared from Euura sp. 

 on Salix californica. Records at hand include rearings from Salix 

 lasiolepis leaves at San Francisco and Moraga Valley, Contra Costa 

 Co., Calif.; and from Salix petiolaris at Winnipeg, Man. Sawfly 

 records include rearings from Euura sp. at Churchill, Man.; Nematus 

 sp. at Snowden, Man.; Pontania californica Marlatt, and Pontania 

 sp. at Berkeley, Calif.; Pontania sp. at Bellingham and Wiser Lake, 

 Wash.; and Pontania? desmodioides Walsh at Ottawa, Ont. 



This subspecies has a transcontinental distribution in the Hud- 

 sonian, Transition, and Canadian zones. A single female from 

 Chesterfield, Northwest Territories (the only arctic record for the 

 genus in North America) establishes its occurrence in the Arctic zone. 



III. IMPARIS GROUP 



A separate group is established for imparis largely on the basis of 

 the short sheath of the female, which is reminiscent of the subgenus 

 Ateleophadnus. Otherwise the species might be included in the 

 hispae group. 



6. Scambus (Scambus) imparis W alley, new species 



Figures 310,b; 310,h; 311,k 



Male: Front wing about 3.5 mm. long; antenna with 20 segments; 

 temple, as seen from above, strongly rounded ; thorax and propodeum 

 moderately stout; dorsomedial carinae of propodeum weak and not 

 extending beyond its basal 0.5; front femur with a narrow, rather 

 shallow, preapical excision beneath; front tibia distinctly bent; hind 



