44 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



■whitish in front. Lef>s yellowish red; all the femora, except the tip, 

 and the last two joints of all the tarsi, black ; hind metatarsi, and the 

 hind tibiae iu the middle, fuscous. Tegulae yellowish white ; halteres 

 reddish yellow. Winjis cinereous hyaline; veins reddish yellow, on 

 the outer part and behind black ; stigma yellow. 

 Six specimens, Virginia (Mr. Theo. Pergande). 



Chilosia comosa. 



Chilo^iu comosa Loew, Centnr., iv, 66. 

 Habitat. — Colorado!, English River, Winnepeg (Lw.). 

 S . Length, 6™™. Shining metallic green, with rather long yellowish 

 pile. Frontal triangle large, with blackish pile. Face shining black, 

 lightly pollinose on the sides and above. Antennae rather small, first 

 joint black, second and third joints obscurely red ; arista black, bare. 

 Eyes bare. Scutellum without black bristles. Abdomen wholly shin- 

 ing, but less so on the anterior segments. Legs black ; tip of femora, 

 base and tip of tibiae, yellowish red. Wings cinereous hyaline, stigma 

 and veins yellowish, the latter on the outer part and the costa darker. 

 9 . The pile shorter, the third antennal joint larger and lighter-col- 

 ored, the tibiae in larger part, and the tarsi m part, yellowish red. 

 Two males and one female from Colorado. 



Chilosia nigripennis. (Plate II, fig. 14.) 



t7iei7o8ia ni(/nj)e««is WillistoD, Proc. Am. Phil. Soc. xx, .307. 

 Carlosyrphus infumatns Bigot, Aunales Soc. Eut. France, 1884, 553. 



Habitat. — Mount Hood, Oregon !. 



$ . Length, 6 to 7 •"■". Deep black. Eyes bare. Frontal triangle and 

 face shining black, the former a little fossulate, the latter very slightly 

 excavated below the antennae, below the tubercle shortly and deeply 

 concave; sparsely blackish pilose. Antennae small, basal joints black, 

 third joint reddish brown or brown, rounded ; arista bare. Thorax 

 black, nearly opaque, with short black pile above, longer on the scutel- 

 lum and pleurae ; scutellum shining, without bristles. Abdomen short, 

 broadly oval, depressed ; opaque velvety black, with a bluish cast ; pile 

 on the sides of the anterior segments reddish yellow ; anterior angles of 

 the third and fourth segments shining metallic; hypopygium shining. 

 Teguhe with a blackish border, and a fringe of black pile. Legs wholly 

 black. Wings blackish in front, clearer behind ; veins black. 



Three specimens from Mount Hood, Oregon. 



Chilosia versipellis, n. sp. 

 Habitat. — Washington Territory !. 



S . Length, 5^ ^^\ Antennfe small, first two joints black, third sub- 

 quadrate, reddish yellow ; arista bare. Frontal triangle much swollen, 

 fossulate, pile black. Face shining black, with short, sparse pile, gently 

 concave below the antennae, in the middle forming a very obtuse angu- 

 lar tubercle, thence gently concave. Eyes bare. Thorax black, nearly 

 oi)aque, with black pile of moderate length. Tegulaj light yellow, with 

 a fringe of light yellow pile ; halteres yellow. Abdomen deep velvety 



