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



Female : Front and vertex shining black ; moderately wide and but little 

 narrowed above, with short sparse white pile, longer and yellowish at the 

 vertex; a white poUinose band across the front extending down along the 

 eyes to meet with similar pollen of face ; face short, moderately concave, 

 subshining, brownish, lighter about the oral margin, lightly whitish pol- 

 linose; cheeks dull black, sparsely grey pilose; antennae brown; third 

 segment dark brown at tip, reddish at base, moderately broad, rounding; 

 arista basal, dark brown, reddish at 'base, twice as long as antennae. 



Thorax black with coppery reflections ; scutellum blue-black with four 

 conspicuous black bristles on the margin; thorax with usual whitish 

 sericeous spots inside of humeri. 



Abdomen : first segment dull shining brown, sparsely short white pilose 

 on disc, elongate pilose on margin; second and third segments of same 

 color, small sub-triangular yellow spots on side not reaching margin; 

 fourth segment more shining, black with triangular areas of elongate 

 whitish pile on sides. 



Legs brown with white pile, hind femora dark, with double row of short 

 strong spines below. The base of all and the tip of the middle and front 

 tibiae and the basal segments of tarsi of the front and middle legs light yel- 

 low ; hind tibiae moderately arcuate, dark brown, except the base, as are the 

 hind tarsi and the distal segments of middle and front tarsi ; wings hyaline, 

 stigma light yellow. 



Holotype (No. 498), female, in Museum of the California 

 Academy of Sciences, collected at Hood River, Ore., June 6, 

 1917, by F. R. Cole. 



Near ncmonim; varies in bristles on margin of scutellum, 

 etc. 



30. Xylota stigmatipennis Lovett, new species 



Length 7 mm. Face and front shining black ; a very heavy 

 silvery white pollinose cross-band below the antennae, extend- 

 ing narrowly upward along margin of eyes two-thirds of way 

 to vertex and downward along eye margins a short distance 

 then out as a distinct line to oral margin ; thorax and scutellum 

 shining black with short light golden pile; abdomen blackish, 

 opaque on the disc, with a pair of yellow quadrangular spots 

 on the anterior margin of second segment. 



Female : Front and vertex broad, shining black, short white pilose, but 

 little narrowed at vertex; a median depressed line from lower ocelli to 

 near base of antennae; the crescentic pollinose spots on front eye-margin 

 connect narrowly with a broad heavy silvery pollinose band below the 

 antennae ; face and cheeks shining black ; a pollinose line extending ob- 

 liquely from oral margin to eye-margin, separating face and cheeks, and 

 extending upward along eye-margin to connect with cross-band ; sparsely 

 white pilose along eye margin; antennal prominence produced; antennae 

 brown-black, short ; third joint broadly rounded, a little longer than broad ; 

 arista black. 



Thorax shining black with obscure coppery reflections ; whitish sericeous 

 spots on inside of humeri produced inward almost to median line; scutel- 

 lum shining black with coarse shallow punctures. 



