sisrow: diptera of Colorado and new mexico. 237 



joint reddish below. Face on the sides with thin light colored pile 

 except above, where the black pile of the front descends below the 

 antennae; cheeks greenish black; on the face in front of the cheeks 

 and around the oral margin, broadly black; tubercle brown, some- 

 times darker; the dark color does not extend above the tubercle as a 

 stripe. Occiput with a fringe of fulvous pile. Thorax metallic bluish 

 black, with rather thick golden yellow pile. Scutellum not much 

 darker than the thorax. Abdomen broadly oval, a little shining, on 

 the fourth and fifth segments more shining; the spots or bands of the 

 abdomen are brick red, those of the second and sometimes of the 

 third segments more reddish yellow; they are all well separated from 

 the lateral margins; spots of the second segment rather small, oval or 

 subtriangular; spots of the third and fourth segments about two- 

 thirds of the width of the segment, often widely interrupted, especially 

 those of the third segment, and frequently forming an uninterrupted 

 or subinterrupted emarginate band; both bands nearly touch the an- 

 terior margin of their segments; the wide posterior border of the 

 fourth and all of the fifth segment, brick red; the shining portions of 

 the abdomen generally show a distinct blue reflection. Legs brown- 

 ish, basal half of front and middle femora, and basal two-thirds of 

 hind femora black; median joints of hind tarsi dark brown. Wings 

 hyaline, at the base and near the costa with a brownish tinge. — Length 

 7.5 — 10 mm. 



Forty-five males taken above timberline (between 11,000 and 

 12,000 ft.) on iMt. Hallett, near Estes Park, Colo. (Aug.). 



A well marked and easily distinguishable species. 



Syrphus umbellatarum Schin. 



Five females, Manitou Park, Colo. (.Aug ); one female, Magdalena 

 mountains, N. M. (Aug.).^Known also from the WHiite mountains, 

 N. H., and Arizona. 



Syrphus pullulus, n. sp. 



Male. Eyes bare. Front black, covered with grayish pollen 

 except anteriorly, and black pilose. Antenna black. Face brownish 

 yellow with blue reflections, on the sides whitish poUinose and black 

 pilose; in the middle with a black stripe which extends broadly along 

 the oral margin to the black cheeks. X)cciput white pilose. Thorax 

 greenish black, but little shining; pile mostly obscure fulvous. Scu- 

 tellum brown, darker at the basal angles, with a distinctly metallic 

 blue reflection, clothed with long black pile. Abdomen considerably 

 narrower than the thorax, with almost parallel sides and three pairs 

 of rather small, transverse yellow spots, very much as in umbeUatariim; 

 opaque, fifth segment subopaque, first segment and hypopygium shin- 



