476 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 part 3 



mng, spot on metapleurum, area on propodeum (usually large), 

 often spot on liind coxa, usually most of front and middle coxae, legs 

 beyond coxae except usually for subapical 0.4 ± of hind femur, and 

 most of abdomen, yellow. The second to fourth tergites are black at 

 base and sometimes the fifth tergite is narrowly black at base. Wings 

 with a yellow tinge and faint infuscation. 



Specimens (46 cf, 329): From California (Albany, Alum Rock 

 Park in Santa Clara Co., Arroyo Seco in Monterey Co., Bass Lake in 

 Madera Co., Berkeley, Briceburg at 1,500 ft., Cache Creek in Lake 

 Co., Casa Loma, 5 miles north of Cassel, Chile Bar in El Dorado Co., 

 Danville, Dardanelle, Dodge Ridge in Tuolumne Co., Downieville 

 at 3,900 ft., Duncans Mills, Dublin in Alameda Co., Fort Seward, 

 Graeagle, Hat Creek, Idylwild in San Jacinto Mts., 1 mile south of 

 Lafayette, Lakeport, Leland Meadow in Tuolumne Co., Lucerne, 

 Mill Valley, Mint Canyon in Napa Co., Oakhurst, Oaldand, Palo 

 Alto, 10 miles east of Rutherford, San Antonio Canyon, "Sancelito," 

 Santa Cruz, Sardine Lakes in Sierra Co., Sobre Vista in Sonoma Co., 

 Strawberry in Tuolumne Co., Summit Camp in Lassen Co., Tanbark 

 Flat in Los Angeles Co., and Volcano Lake in Sierra Co.); and Oregon 

 (Ashland and Hood River). There is also a male specimen collected 

 by A. Agassiz on the "Gulf of Georgia," Lake Superior (Cambridge), 

 that has about as much yellow as would be expected in a male of this 

 subspecies. It seems to be an abnormally colored individual for its 

 locality, but may be another example of the tendency for this part of 

 Canada to have western forms. 



Most of the specimens were collected from May 1 to the end of 

 July. Collection dates outside of this range are : March 25 and April 

 15 and 30 at Berkeley, Calif.; April 23 and 29 at Albany, Calif.; 

 April 26 at Palo Alto, Calif.; "April" at Lucerne, Calif.: August 3 at 

 Lucerne, Calif.; August 30 at Volcano Lake, Sierra Co., Calif.; and 

 "September" at Mill Valley, Calif. Reared specimens comprise 2(S^, 

 19, from old nests of Sceli'phron, Lucerne, Calif., 1951 and 1952, 

 H. B. Leech, cf , from nest of Sceliphron caementarium, Ashland, Oreg., 

 December 1938, H. W. Prescott. 9, taken dead from mud nests, 

 Duncans Mills, Calif., July 1908. 



This subspecies occurs in California and Oregon. 



4. SUBTRIBE ECHTHRINA 



Clypeus usually rather large, usually wealdy convex, often with a 

 preapical transverse ridge, its apex usually more or less truncate 

 and often with a median apical tooth or pair of teeth; mandible about 

 1.8 to 3.0 as long as it is wide at middle, its lower tooth at least as 

 long as upper tooth, frequently a little longer; flagellum moderately 



