Bulletin of the United States Geological and Geographical Survey of the Territories, Volume 3, Issue 2

abdomen angles antennæ antennæ black anteriorly apex apical arcuated band basal joint base beset black pile black spot blackish breadth bristles broad broadly brownish brownish-yellow California Cañon City central eyes Centur cephalothorax clypeus coarsely Colo color Colorado convex corium coxæ cross-band cross-vein curved dark brown densely Denver Diptera distal dorsum female femora fovea front genus grayish halteres head hemelytra Hemipt hind margin hyaline July labium lateral margins legs Length lobes Loew longer longitudinal male maxillæ middle millim millimeters moderately narrow nearly nervures oblique ocelli outer ovipositor paler palpi patella piceous pleuræ pollen posterior cell posterior margin posteriorly pronotum pubescent punctate punctures reddish Rostrum rounded scutellum second joint shining short shorter side sinuated slender slightly Sonoma County species specimens spines Stål sternum stripe tarsi testaceous third joint third vein thorax tibia tibiæ tinged transverse tylus Uhler venter vertex vulva white pile whitish wings yellowish