F. R. COLE 37 



"Hab. — Webber Lake, Sierra County, California, July 23 to 26. Not rare, 

 flying in circles around flowers. Three males and two females. A male and a 

 female from Calaveras County, California, June, have the proboscis a little 

 longer than the abdomen. 



"This species is easily distinguished from E. smaragdinus female by its 

 smaller size, blue color, shorter proboscis, less yellowish wings; the two latter 

 characters also distinguish the males, which are somewhat alike in coloring. 



"All my specimens, as far as I can remember, were more blue when I took 

 them, and seem to have assumed the purple and even greenish tinges, which 

 they now have, in the process of drying." 



A specimen from Siskiyou County, California, has dark brown 

 antennae, lighter at the base; the body is green. One from Mt. 

 Angel, Oregon, is dark green, with purple reflections on the abdo- 

 men. The antennae are short, dark brown, and with the third 

 joint pointed. Proboscis a little longer than the body. Two 

 specimens from Humboldt County, Cahfornia, have very long 

 wings. The third antennal joint is long and very slender. The 

 second submarginal cell is hardly petiolate; legs dark, the femora 

 brown, knees yellow; the til3iae are yellowish brown at the apex 

 and on the inner side. Proboscis shorter than the body, which is 

 dark bluish green and very flat. Perhaps this form belongs with 

 tristis or is a variety. 



A small specimen from Siskiyou County, California (Coquillett), 

 is seven millimeters long. Thorax green with a blue tinge, abdo- 

 men azure. One specimen from the Wasatch Mountains, Utah 

 (C. V. Riley), has the tarsi darker than the rest of the legs. 

 Several specimens from Placer County, California, vary from blue 

 to green. One specimen in the National Museum from Utah 

 differs from any I have seen. The thorax is dark metallic blue. 

 The humeri, occiput and scutellum are purple. Two median dor- 

 sal stripes of purple on the abdomen, and two short ones on each 

 side. Legs straw yellow. Pleura blue with purpHsh reflections. 

 Abdomen and venter purple. Antennae black, the third joint 

 pointed. Femora light yellowish brown, the knees yellow; tarsi 

 yellowish brown. Proboscis very short and black. Whitish pile 

 on the eyes very short. Three submarginal cells, the cross-vein 

 not placed the same in each wing. Costal cell yellowish. 



On July 12, 1918, I made a trip to the countr>^ near the old lava 

 beds which lie at the base of Mt. Hood, in the upper Hood River 

 Valley of Oregon. About three weeks before I had found several 



TRANS. AM. ENT. SOC, XLV. 



