20 



U. S. NATIONAL MUSEUM BULLETIN 209 



Nearly all collection dates fall between July 1 and Sept. 16. Those 

 outside this range arc: June 27 at Camp Umatilla, Wash.; June 30 

 at Flagstaff, Ariz.; Sept. 28 at Clarkston, Wash.; Sept. 29 at Summer- 

 land, British Columbia; Sept. 30 at Logan, Utah; Oct. 13 at Pullman, 

 Wash.; and Oct. 14 at Council, Idaho. One male was collected on 

 the flowers of Cleome serrulata. 



This species occurs from British Columbia to Mexico, but not in the 

 typical Rocky Mountain States of Montana, Wyoming, and Colorado. 

 Apparently it is commonest in the Canadian Zone and south of Oregon 

 is found only at higher altitudes. Adults are on the wing in the 

 last half of summer and in early fall. 



5. Chirodamus maculipennis (Smith) 



Plate 2, figure 15 



Pompilus maculipennis Smith, 1855, Catalogue of the hymenopterous insects in 

 the British Museum, pt 3, p. 159, 9 • Type: 9 , North America (London). 



Male: Forewing 14 mm. long; tooth on outer claw of fore tarsus 

 about 0,45 as long as the part of the claw beyond it, subparallel with 

 it; mesopleuron subshining, with close fine punctures and larger 

 punctures separated hy about 3.0 their diameter; abdomen with a 

 rather strong constriction between the first and second tergites; 



Figure 6. — Localities for Chirodamus maculipennis, 



transverse groove on second sternite foveolate (not foveolate in the 

 other Nearctic species of the genus); apical margin of fifth sternite 

 rather strongly concave, its hair about 1.3 as long as the length of the 

 sternite (the hair about 0.5 as long in the other Nearctic species of 

 the genus). 



Black. Inner orbit without a yellowish stripe; wings black, the 

 forewing with an oval or subcircular orange spot centering below 

 the stigma and occupying 0.5 the width of the wing. 



