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



Several specimens observed in collection of Washington 

 State College (Cole). 



Near media; distinguished by large size, plumose antennae 

 and lines on thorax. 



32. Syrphus bimaculata Lovett, new species 

 (Plate 18, fig. 25) 



Face yellow, with brown median stripe not reaching base of 

 antennae; cheeks black; eyes bare; thorax with golden pile; 

 scutellum light yellow; abdomen black subshining; second seg- 

 ment on anterior third with moderately narrow, interrupted 

 band which reaches the lateral margins; posterior margins of 

 fourth and fifth segments yellow, this color not reaching lateral 

 margin. Length 7 mm. 



Female : Face shining yellow with black pile ; a narrow brown median 

 line from just below, but not reaching, the antennae to oral margin; oral 

 margin and cheeks dull brown, greyish pruinose below; pile on cheeks and 

 occiput light golden; front and vertex black, shining above antennae, a 

 broad golden pollinose band across front and extending along eyes to base 

 of antennae; vertex opaque black; front and vertex with black pile. The 

 prominence just at base of antennae with a conspicuous honey yellow cres- 

 cent; antennae brown; first joint, second below, and third basally and along 

 lower margin sparingly, light yellowish brown, elsewhere dark ; arista basal, 

 brown, lighter on basal third, dark brown terminally. 



Thorax shining bronze-black with light golden pile ; scutellum ihoney yel- 

 low, pile longer and lighter. 



Abdomen subshining black; second segment opaque black with elongate 

 narrow yellow spots, rather broadly interrupted, arcuate and reaching the 

 lateral margins for their full width near the anterior lateral angle; seg- 

 ments three, four and five black, subshining; posterior margin of fourth 

 and fifth, broadly yellow, but the yellow not extending to lateral margin; 

 pile moderately elongate, golden, on first segment and on yellow portions 

 of second, elsewhere short, black. 



Legs : Front and middle pair yellow throughout, hind pair brown, under 

 surface of femur light brown; wings hyaline; stigma brown; halteres honey 

 yellow. 



Holotype (No. 501), female, in Museum of the California 

 Academy of Sciences, collected at Mt. Jefferson, Ore., July 15, 

 1907, by Bridwell. 



Another female, Mary's Peak, Ore., June 6, 1915 (Lovett, 

 collector). 



This species is distinct from any Syrphus known to us in that 

 it has but one band, or two spots, on the abdomen. It is simi- 

 lar in some ways to 5. hifasciata, but appears distinct even 

 from the many unusual varieties of this characteristic form. 



