378 ERNEST A. BACK. 



pruinose and densely white pilose, the four marginal bristles black. 

 Metanotum polished black, a large silvery-white spot on each side. 

 Abdomen polished, bluish-black, marked with light gray bloom, as 

 follows: a spot on the sides of the first segment, a transverse anterior 

 and two posterior lateral oblique spots on each remaining segment, 

 the anterior spot obsolete on the last two segments, the posterior spots 

 uniting with the gray lateral margin except on the second segment, 

 each extending obliquely inward from the posterior angle of the 

 segment, and reaching at least a third of the distance across the seg- 

 ment, those on the sixth segment united; pile of dorsum very short, 

 sparse, depressed, mostly light yellowish, that of the sides and venter 

 longer and white. Pile of legs white, the bristles light yellow; front 

 and hind tibiae and their metatarsi densely bright yellow pubescent 

 within, spur of front tibiae rather slender, middle tibiae also furnished 

 with a strong, nearly straight black spur at the tip within. Wings 

 pure hyaline, the extreme apex gray, a large brown cloud on veins at 

 bases of the first and second submarginal cell, of each posterior cell 

 and on the discal cell. All the posterior and anal cells open, second 

 submarginal cell destitute of a stump of a vein. Halteres black." 



Type.—U. S. N. M., Cat. No. 10,426. A single female 

 specimen. 



Habitat. — Ventura Co., Cal. (April). 



Coplmra fallei n. sp. (PI. VIII, fig. 5). 



% 9- — Length 10-12 mm. — Wholly black; face and occiput grayish; 

 front and thorax more brownish pruinose; abdomen polished black, 

 segments 2-6 with posterior lateral angles grayish pruinose. Wings 

 mainly hyaline with brown clouds at the furcation of the second and 

 third longitudinal veins, furcation of third vein, at base of the discal 

 cell and base of the second and third posterior cells. Thoracic dorsum 

 along the middle from prothorax to scutellum with a very prominent crest 

 of long black hair; scutellum above clothed with fine whitish pile and on 

 the margin with a fringe of many long black hair-like bristles. 



Face rather weakly gibbose, mystax deep black, reaching nearly to 

 antennas; pile of front long, erect, sparse; of the ocellar tubercle more 

 abundant, longer and prominent; on both, black or brownish. Pile 

 of occiput brown, the beard grayish. Proboscis and palpi small. 

 Antennae wholly black, the basal segments with brownish hair and 

 bristles: segments 1 and 2 cylindrical, segment 3 elongate, but hardly 

 twice as long as the basal segments, style slender, hardly more slender 

 at base than tip of third segment, about one-half as long as- the third 

 segment and terminated by a fine bristle. Weak bristles on sides of 

 thoracic dorsum brownish, the pile scarce and grayish; pile of pleurae 

 long, fine, located in tufts on the posterior portion of the mesopleurae 

 and before the halteres. Halteres blackish. Abdomen polished, the 



