528 U. S. NATIONAL MUSEUM BULLETIN 216 part 3 



but with moderately extensive sutural infuscation on the thorax. 

 The whitish markings are restricted and rather obscm^e, or absent. 3. 

 In the western half of the continent, south of the latitude of San 

 Francisco, most individuals are almost uniformly fulvous, with little 

 or no sutural infuscation on the thorax. The pale markings on the 

 head and pronotum are yellowish rather than whitish. These three 

 races have not been treated as subspecies because of the frequency of 

 individuals colored out of conformity with their geographic location. 

 Some of the apparently irregular variation seems to be due to nutrition, 

 and to whether the spring or summer generation is involved. If these 

 variables were ruled out or taken into consideration one could probably 

 define defensible subspecies. Specimens from the Hudsonian and 

 Canadian zones tend to have the coxae and trochanters more or less 

 infuscate, thus approaching the coloration of the European subspecies. 



Specimens of overwintering form (24 cf, 759): From Arizona (Oak 

 Creek Canyon and Worlonan Creek in Sierra Ancha) ; British Columbia 

 (Robson and Victoria); California (Camp Nelson, Carmel, 4 miles 

 south of Hat Creek, Mill Valley, and Stanford University) ; Montana 

 (east shore of Flathead Lake); New York (Ithaca, New Baltimore, 

 and New York) ; Oregon (Eugene) ; Pennsylvania (Spring Brook and 

 West Manayunk) ; South Carolina (near Tigerville) ; and Washington 

 (Lake Cushman in Mason Co.). 



The majority of the available specimens were reared, all emerging 

 in the fall and early winter. Field collected specimens are dated as 

 follows: April 9 at Eugene, Oreg. ; April 15 at Carmel, Calif.; April 26 

 at Camp Nelson, Tulare Co., Calif.; May 3 at Workman Creek, 

 Sierra Ancha, Ariz.; May 8 near Tigerville, S.C.; May 10 at Flathead 

 Lake, Mont.; May 21 in Oak Creek Canyon, Ariz.; June 4, four miles 

 south of Hat Creek, Shasta Co., Calif.; June 11 at Spring Brook, Pa.; 

 June 18 at Robson, B.C.; and July 9 at Lake Cushman, Mason Co., 

 Wash. 



Host records on pin labels include four lots reared from Vespula 

 maculata and four from Vespula sp., and a male from a "Polistes" 

 nest, Mill Valley, Calif., Feb. 4, 1953, H. B. Leech. 



Specimens of summer form (909): From Alberta (Drayton); 

 British Columbia (Langley, Alount Seymour near Vancouver at 700 

 ft., shore of Shuswap Lake near Salmon Arm, Trinity Valley, and 

 Vancouver); California (Big Dann Creek in Mendocino Co., Mill 

 Valley, Snow Flat in Yosemite Park at 8,700 ft., Sonora, and Stanford 

 University) ; Maryland (Prince Georges Co.), Michigan (Mecosta Co., 

 Midland Co., and Roscommon Co.); Montana (east shore of Flathead 

 Lake) ; New Hampshire (Pinkham Notch and Randolph) ; New Jersey 

 (Moorestown) ; New York (Bemus Pomt, Bolton, Cranberry Lake, 

 and Six Mile Creek near Ithaca) ; Oregon (Corvallis and Hood River) ; 



