ICHNEUMON-FLIES, PART 2\ XORIDINAE 477 



dichrous. Dichrous itself has weak subdivisions which may prove to be 

 definable subspecies or even species. At higher altitudes in the Cas- 

 cades and Sierra Nevada this species usually has the abdomen red 

 in the female, tinged with red in the male, and with a stouter build and 

 denser sculpture. The stouter build is particularly evident in the 

 shorter tarsal segments. This form is close to brcvicaudus. In the 

 Vancouveran area, at lower altitudes, the species is slender, less 

 densely sculptured, and has the abdomen black in both sexes. Farther 

 south, still at lower altitudes, the slender form is still present with the 

 female abdomen red and the male abdomen usually partly reddish. 



Females are distinguished by the fulvous legs, usually more or less 

 distinct transverse ridges in trough of pronotum, sparse mesoscutal 

 punctures, and very sparsely punctate lower third of hind femur. 

 The abdomen may be either fulvous or black. 



Specimens (168 cf, 779): From British Columbia (Agassiz, Beaver 

 Mouth in the Selkirk Mts., Cultus Lake, Diamond Head Trail near 

 Squamish at 3,300 ft., between Duncan and Cowichan Lake, Grouse 

 Mt. at 3,700 ft., Robson, Rogers Pass at 4,500 ft., Vancouver, Victoria, 

 and Wellington); California (Agnew Meadows in Madera Co., Cam- 

 ino, Carmel, Cisco, Contra Costa Co., Crane Flat in Yosemite Park, 

 Crescent City, Dardanelle, Dyerville, Echo Lake, Fish Camp, near 

 Glacier Point in Yosemite Park, Gold Lake in Sierra Co., Humboldt 

 Co., Lake Almanor in Plumas Co., Lassen Peak in Shasta Co. at 7,500 

 ft., Mill Valley, Mineralking, Old Station, Orick, Portola State 

 Park in San Mateo Co., sand hills near Cliff House in San Francisco, 

 Smoky Jack Camp in Yosemite Park, Snow Flat in Yosemite Park 

 at 8,700 ft., "Summit Lake in Shasta Co.," Tamarack Flat in Yosem- 

 ite Park, Upper Echo Lake at 7,400 ft., and Yosemite Valley); 

 Idaho (Lookout Mt. at Priest Lake and Moscow Mt.); Oregon 

 ("Boyer," Cannon Beach, Corvallis, Hood River, McMinnville, 

 Mount Hood at 3,000 ft., and Seaside); and Washington (Ashford, 

 Elbe, Forks, Glacier, Hoquiam, Kittitas Co., Longmire on Mount 

 Rainier, Mount Constitution on Orcas Island, Mount Rainier at 

 2,900, 3,500, 4,700, 5,000, and 5,500 ft., Paradise Lake on Mount 

 Rainier, Seattle, Summerland Trail on Mount Rainier, "Union City," 

 White River on Mount Rainier, and Yelm). 



Collection dates are from early spring to early fall. Unusually 

 early and late dates are : February 28 at Mill Valley, Calif. ; March 1 

 in Contra Costa Co., Calif.; March 19 at Corvallis, Oreg.; March 31 

 at Boyer, Oreg.; September 10 at Agassiz, B. C; September 20 at 

 Victoria, B. C; and October 15, without locality. 



We have found the species common in many localities in damp 

 Transition forests, resting on the foliage of undergrowth. 



This species occurs in the Transition and Canadian zones, from 



