246 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Holotype (No. 502), male, in Museum of the California 

 Academy of Sciences, collected at Corvallis, Ore., May 17, by 

 A. L. Lovett. 



Five males, May to June, Corvallis, Ore., A. L. Lovett, col- 

 lector. One male and one female, Hood River, May (Cole, 

 collector). 



This species is near S. pauxillus but face not projecting and 

 cross-bands differ. 



34. Didea pacifica Lovett, new species 



Eyes bare, third longitudinal vein deeply sinuous, abdom- 

 inal bands except first not reaching lateral margins ; cheeks, legs 

 and scutellum black. Length 10 mm, 



Male : Face light yellow with silvery pile ; tubercle brown ; stripe extend- 

 ing broadly to oral margin and along upper third; cheeks green-black, 

 slate-grey below eyes ; front brownish with sparse moderately elongate 

 black pile ; two dark brown shining spots at base of antennae connected 

 with inverted V-S'haped, slatey, sub-opaque stripe ; ocelli red ; pile short, 

 black; orbits fringed with yellowish white pile. Antennae: First two joints 

 black ; third deep brownish, elongate oval, obtusely pointed ; arista brown. 



Thorax and scutellum shining blue-black with gray pile, showing golden 

 reflections in certain lights; meso, ptero and sternoplura blue black; mar- 

 gins brownish, with white pile. 



Abdomen black with three greenish yellow cross-bands, the first con- 

 sisting of two large spots on second segment moderately separated and 

 reaching the lateral margins; second and third cross-bands broad, entire, 

 separated from lateral margins by a narrow black border, front margin 

 straight, touching anterior margin of segments ; black posterior band 

 dilated somewhat in middle; fifth and sixth segments shining black, fifth 

 with hint of cross-band on anterior lateral corners. 



Legs black; knees and distal tip of tibiae brownisih. Wings hyaline; 

 stigma greyish ; third vein strongly curved into first posterior cell. 



Holotype (No. 503), male, in Museum of the California 

 Academy of Sciences, collected at Parkdale, Ore., July 12, 

 1917, by R R. Cole. 



Varies from D. fusiceps in black cheeks, black scutellum, 

 darker legs, wholly hyaline wings and in size. 



35. Pipiza oregona Lovett, new species 



(Plate 18, fig. 22) 



Length 9 mm. Black throughout, with bluish reflections; 

 antennae black; legs black; thorax with fine silvery white 

 moderately elongate pile. 



