90 U. S. NATIONAL MUSEUM BULLETIN 216 



1.5 its width, but sometimes opposite basal vein (always opposite 

 basal vein in the other species) ; first tergite exceptionally long, in the 

 male widened basally, about 2.4 as long as its apical width, in female 

 faintly widened apically, about 2.1 as long as wide (in the other species 

 of the genus widened apically in both sexes, about 1.65 as long as wide 

 in male, about 1.4 as long as wide in female); second tergite with 

 rather long and strong oblique basolateral grooves (these grooves 

 shorter and weaker in the other species); lateral sternites of second to 

 fifth abdominal segments about 8 times as long as wide in male, about 

 5 times as long as wide in female (in the other species 4 to 5 times as 

 long as wide in male, about 2 to 4 times as long as wide in female). 



Male: Black. Scape in front except at its base, pedicel in front, 

 palpi, tegula, narrow wedge-shaped mark on upper margin of pro- 

 notum reaching from hind corner about 0.65 the distance to notaulus, 

 front and middle coxae, trochanters except for fuscous upper side of 

 hind first trochanter, front and apex of front and middle femora, and 

 front and middle tibiae except for fulvous tinges, white; clypeus fer- 

 ruginous; front tarsus pale stramineous basally, darker apically; 

 middle tarsus brown, darker apically; hind femur fulvous, with a 

 subapical infuscate band and its extreme apex white; hind tibia 

 infuscate, its basal 0.12 and the basal 0.6 of its lower part whitish; 

 hind tarsus fuscous. 



Female: Black. Clypeus dusky ferruginous; maxillary palpus 

 stramineous, its base fuscous; labial palpus light brown; tegula and 

 wedge-shaped mark on upper margin of pronotum white, the wedge- 

 shaped mark reaching from the hind corner 0.6 the distance to notau- 

 lus; front and middle coxae, trochanters, and femora fulvous, the 

 apex of femora paler; front and middle tibiae dusky fulvous, a little 

 paler at base, below, and on apex of middle tibia in front; front tarsus 

 dusky fulvous ; middle tarsus infuscate ; hind tarsus fuscous ; hind coxa, 

 trochanters, and femur fulvous, the femur infuscate near apex, its 

 extreme apex stramineous; hind tibia fuscous, paler on its basal 0.12 

 and below. 



Specimens (12 cf, 1009): From British Columbia (Departure Bay, 

 Kaslo, Robson, Vancouver, Victoria, and Wellington) ; California (Big 

 Sur, Boulder Creek, Camino, Carmel, Fish Camp, Giant Forest in 

 Tulare Co., Mesa Grande in Sonoma Co., Monterey Co., mountains 

 near Claremont, Pacific Grove, Paradise Valley in Fresno Co., Santa 

 Clara Co., San Jacinto Mts., Santa Cruz, and Yosemite Valley); 

 Colorado (near Estes Park and Steamboat Springs) ; Maryland (Ta- 

 koma Park); Michigan (Coopersville, East Lansing, Midland Co., and 

 Seney); Montana (Madison River in Gallatin National Forest and 

 Lake McDonald) ; New York (Bemus Point, Ithaca, and New Russia) ; 

 Ohio (Summit Co.); Ontario (Ottawa); Oregon (Corvallis); Pennsyl- 



